18-3+21=x-3

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Solution for 18-3+21=x-3 equation:


Simplifying
18 + -3 + 21 = x + -3

Combine like terms: 18 + -3 = 15
15 + 21 = x + -3

Combine like terms: 15 + 21 = 36
36 = x + -3

Reorder the terms:
36 = -3 + x

Solving
36 = -3 + 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.
36 + -1x = -3 + x + -1x

Combine like terms: x + -1x = 0
36 + -1x = -3 + 0
36 + -1x = -3

Add '-36' to each side of the equation.
36 + -36 + -1x = -3 + -36

Combine like terms: 36 + -36 = 0
0 + -1x = -3 + -36
-1x = -3 + -36

Combine like terms: -3 + -36 = -39
-1x = -39

Divide each side by '-1'.
x = 39

Simplifying
x = 39

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