12-(-8x)+2x-(-9)=

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Solution for 12-(-8x)+2x-(-9)= equation:


Simplifying
12 + -1(-8x) + 2x + -1(-9) = 0

Remove parenthesis around (-8x)
12 + -1 * -8x + 2x + -1(-9) = 0

Multiply -1 * -8
12 + 8x + 2x + -1(-9) = 0

Multiply -1 * -9
12 + 8x + 2x + 9 = 0

Reorder the terms:
12 + 9 + 8x + 2x = 0

Combine like terms: 12 + 9 = 21
21 + 8x + 2x = 0

Combine like terms: 8x + 2x = 10x
21 + 10x = 0

Solving
21 + 10x = 0

Solving for variable 'x'.

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

Add '-21' to each side of the equation.
21 + -21 + 10x = 0 + -21

Combine like terms: 21 + -21 = 0
0 + 10x = 0 + -21
10x = 0 + -21

Combine like terms: 0 + -21 = -21
10x = -21

Divide each side by '10'.
x = -2.1

Simplifying
x = -2.1

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