# Math

posted by .

Find the value of x

40-x/3=4

please not the / means a fraction.

I already know that x is 28 when I first saw the question but I'm not sure how to show my working out.

• Math (ANYONE! -

Please I'm really struggling

• Math -

40 - x / 3 = 4 Add x / 3 to both sides

40 - x / 3 + x / 3 = 4 + x / 3

40 = 4 + x / 3 Subtract 4 to both sides

40 - 4 = 4 + x / 3 - 4

36 = x / 3 Multiply both sides by 3

108 = x

x = 108

• Math -

if you put that back into the equation it doesn't work.

• Math -

If your exspressio mean :

( 40 - x ) / 3 = 4

Then multiply both sides by 3

3 * ( 40 - x ) / 3 = 3 * 4

40 - x = 12 Subtract 12 to both sides

40 - x - 12 = 12 - 12

28 - x = 0 Add x to both sides

28 - x + x = 0 + x

28 = x

x = 28

• Math -

thank you!!

• Math -

You're welcome

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