21-8x-9-(-7x)=0

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Solution for 21-8x-9-(-7x)=0 equation:


Simplifying
21 + -8x + -9 + -1(-7x) = 0

Remove parenthesis around (-7x)
21 + -8x + -9 + -1 * -7x = 0

Multiply -1 * -7
21 + -8x + -9 + 7x = 0

Reorder the terms:
21 + -9 + -8x + 7x = 0

Combine like terms: 21 + -9 = 12
12 + -8x + 7x = 0

Combine like terms: -8x + 7x = -1x
12 + -1x = 0

Solving
12 + -1x = 0

Solving for variable 'x'.

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

Add '-12' to each side of the equation.
12 + -12 + -1x = 0 + -12

Combine like terms: 12 + -12 = 0
0 + -1x = 0 + -12
-1x = 0 + -12

Combine like terms: 0 + -12 = -12
-1x = -12

Divide each side by '-1'.
x = 12

Simplifying
x = 12

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