39-21=x-9

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Solution for 39-21=x-9 equation:


Simplifying
39 + -21 = x + -9

Combine like terms: 39 + -21 = 18
18 = x + -9

Reorder the terms:
18 = -9 + x

Solving
18 = -9 + x

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-1x' to each side of the equation.
18 + -1x = -9 + x + -1x

Combine like terms: x + -1x = 0
18 + -1x = -9 + 0
18 + -1x = -9

Add '-18' to each side of the equation.
18 + -18 + -1x = -9 + -18

Combine like terms: 18 + -18 = 0
0 + -1x = -9 + -18
-1x = -9 + -18

Combine like terms: -9 + -18 = -27
-1x = -27

Divide each side by '-1'.
x = 27

Simplifying
x = 27

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