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Solve x/3 + 2 = x/2

Step by step, with the reason for every step · Linear equations · Algebra 1

Step by step

The question

Question: solve x/3 + 2 = x/2.

x3 + 2 = x2

1 Remove the fractions

The bottom numbers are 3 and 2.

6 can be divided by all of them.

We multiply every part by 6.

We do it on both sides.

Why both sides?

The = sign means both sides are the same amount.

If we change only one side, they are not the same any more.

6 × x3 + 6 × 2 = 6 × x2

6 divided by 3 is 2.

6 divided by 2 is 3.

Write what is left.

2 × x + 6 × 2 = 3 × x

Do the multiplications.

No more fractions!

2x + 12 = 3x

2 Get x on one side

There is x on both sides.

We want x on one side only.

So we remove the 2x from the left side.

To remove 2x, we take away 2x.

We do it on both sides, so they stay equal.

2x + 12 − 2x = 3x − 2x

2x and − 2x make zero.

Cross them out.

3x − 2x = x.

3x − 2x = x

Now we have 12 = x.

12 = x

Let's swap the two sides, so x is on the left.

x = 12

So x = 12!

3 Check

Let's check: put 12 in place of x.

First the left side.

Left: 123 + 2 = 4 + 2 = 6

Now the right side.

Right: 122 = 6

Both sides are 6.

So x = 12 is right!

Both sides equal 6

Let's look back.

First: remove the fractions.

Then: get x on one side.

Last: check.

Answer
x = 12

Your turn

Try this one yourself, then check:

x6 + 3 = x3
Show the answer
x = 18

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