90=x+80

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Solution for 90=x+80 equation:


Simplifying
90 = x + 80

Reorder the terms:
90 = 80 + x

Solving
90 = 80 + 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.
90 + -1x = 80 + x + -1x

Combine like terms: x + -1x = 0
90 + -1x = 80 + 0
90 + -1x = 80

Add '-90' to each side of the equation.
90 + -90 + -1x = 80 + -90

Combine like terms: 90 + -90 = 0
0 + -1x = 80 + -90
-1x = 80 + -90

Combine like terms: 80 + -90 = -10
-1x = -10

Divide each side by '-1'.
x = 10

Simplifying
x = 10

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