-7x-13x=100

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Solution for -7x-13x=100 equation: 


Simplifying
-7x + -13x = 100

Combine like terms: -7x + -13x = -20x
-20x = 100

Solving
-20x = 100

Solving for variable 'x'.

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

Divide each side by '-20'.
x = -5

Simplifying
x = -5

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