21-(x+7)=8x-4

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Solution for 21-(x+7)=8x-4 equation:


Simplifying
21 + -1(x + 7) = 8x + -4

Reorder the terms:
21 + -1(7 + x) = 8x + -4
21 + (7 * -1 + x * -1) = 8x + -4
21 + (-7 + -1x) = 8x + -4

Combine like terms: 21 + -7 = 14
14 + -1x = 8x + -4

Reorder the terms:
14 + -1x = -4 + 8x

Solving
14 + -1x = -4 + 8x

Solving for variable 'x'.

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

Add '-8x' to each side of the equation.
14 + -1x + -8x = -4 + 8x + -8x

Combine like terms: -1x + -8x = -9x
14 + -9x = -4 + 8x + -8x

Combine like terms: 8x + -8x = 0
14 + -9x = -4 + 0
14 + -9x = -4

Add '-14' to each side of the equation.
14 + -14 + -9x = -4 + -14

Combine like terms: 14 + -14 = 0
0 + -9x = -4 + -14
-9x = -4 + -14

Combine like terms: -4 + -14 = -18
-9x = -18

Divide each side by '-9'.
x = 2

Simplifying
x = 2

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