129=x+90

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Solution for 129=x+90 equation:


Simplifying
129 = x + 90

Reorder the terms:
129 = 90 + x

Solving
129 = 90 + 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.
129 + -1x = 90 + x + -1x

Combine like terms: x + -1x = 0
129 + -1x = 90 + 0
129 + -1x = 90

Add '-129' to each side of the equation.
129 + -129 + -1x = 90 + -129

Combine like terms: 129 + -129 = 0
0 + -1x = 90 + -129
-1x = 90 + -129

Combine like terms: 90 + -129 = -39
-1x = -39

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

Simplifying
x = 39

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