8-7x-6x=21

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Solution for 8-7x-6x=21 equation: 


Simplifying
8 + -7x + -6x = 21

Combine like terms: -7x + -6x = -13x
8 + -13x = 21

Solving
8 + -13x = 21

Solving for variable 'x'.

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

Add '-8' to each side of the equation.
8 + -8 + -13x = 21 + -8

Combine like terms: 8 + -8 = 0
0 + -13x = 21 + -8
-13x = 21 + -8

Combine like terms: 21 + -8 = 13
-13x = 13

Divide each side by '-13'.
x = -1

Simplifying
x = -1

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