-6+x-8x-12=-15

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Solution for -6+x-8x-12=-15 equation: 


Simplifying
-6 + x + -8x + -12 = -15

Reorder the terms:
-6 + -12 + x + -8x = -15

Combine like terms: -6 + -12 = -18
-18 + x + -8x = -15

Combine like terms: x + -8x = -7x
-18 + -7x = -15

Solving
-18 + -7x = -15

Solving for variable 'x'.

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

Add '18' to each side of the equation.
-18 + 18 + -7x = -15 + 18

Combine like terms: -18 + 18 = 0
0 + -7x = -15 + 18
-7x = -15 + 18

Combine like terms: -15 + 18 = 3
-7x = 3

Divide each side by '-7'.
x = -0.4285714286

Simplifying
x = -0.4285714286

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