20+(x-8)=90

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Solution for 20+(x-8)=90 equation:


Simplifying
20 + (x + -8) = 90

Reorder the terms:
20 + (-8 + x) = 90

Remove parenthesis around (-8 + x)
20 + -8 + x = 90

Combine like terms: 20 + -8 = 12
12 + x = 90

Solving
12 + x = 90

Solving for variable 'x'.

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

Add '-12' to each side of the equation.
12 + -12 + x = 90 + -12

Combine like terms: 12 + -12 = 0
0 + x = 90 + -12
x = 90 + -12

Combine like terms: 90 + -12 = 78
x = 78

Simplifying
x = 78

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