x+(x-54)=90

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Solution for x+(x-54)=90 equation:


Simplifying
x + (x + -54) = 90

Reorder the terms:
x + (-54 + x) = 90

Remove parenthesis around (-54 + x)
x + -54 + x = 90

Reorder the terms:
-54 + x + x = 90

Combine like terms: x + x = 2x
-54 + 2x = 90

Solving
-54 + 2x = 90

Solving for variable 'x'.

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

Add '54' to each side of the equation.
-54 + 54 + 2x = 90 + 54

Combine like terms: -54 + 54 = 0
0 + 2x = 90 + 54
2x = 90 + 54

Combine like terms: 90 + 54 = 144
2x = 144

Divide each side by '2'.
x = 72

Simplifying
x = 72

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