12.5x-8.5x=-20

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Solution for 12.5x-8.5x=-20 equation: 


Simplifying
12.5x + -8.5x = -20

Combine like terms: 12.5x + -8.5x = 4x
4x = -20

Solving
4x = -20

Solving for variable 'x'.

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

Divide each side by '4'.
x = -5

Simplifying
x = -5

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