-10+x+7x=-90

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Solution for -10+x+7x=-90 equation: 


Simplifying
-10 + x + 7x = -90

Combine like terms: x + 7x = 8x
-10 + 8x = -90

Solving
-10 + 8x = -90

Solving for variable 'x'.

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

Add '10' to each side of the equation.
-10 + 10 + 8x = -90 + 10

Combine like terms: -10 + 10 = 0
0 + 8x = -90 + 10
8x = -90 + 10

Combine like terms: -90 + 10 = -80
8x = -80

Divide each side by '8'.
x = -10

Simplifying
x = -10

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