(X+3)+(x-12)=90

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Solution for (X+3)+(x-12)=90 equation:


Simplifying
(X + 3) + (x + -12) = 90

Reorder the terms:
(3 + X) + (x + -12) = 90

Remove parenthesis around (3 + X)
3 + X + (x + -12) = 90

Reorder the terms:
3 + X + (-12 + x) = 90

Remove parenthesis around (-12 + x)
3 + X + -12 + x = 90

Reorder the terms:
3 + -12 + X + x = 90

Combine like terms: 3 + -12 = -9
-9 + X + x = 90

Solving
-9 + X + x = 90

Solving for variable 'X'.

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

Add '9' to each side of the equation.
-9 + X + 9 + x = 90 + 9

Reorder the terms:
-9 + 9 + X + x = 90 + 9

Combine like terms: -9 + 9 = 0
0 + X + x = 90 + 9
X + x = 90 + 9

Combine like terms: 90 + 9 = 99
X + x = 99

Add '-1x' to each side of the equation.
X + x + -1x = 99 + -1x

Combine like terms: x + -1x = 0
X + 0 = 99 + -1x
X = 99 + -1x

Simplifying
X = 99 + -1x

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