21-(x+9)=7x-4

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Solution for 21-(x+9)=7x-4 equation:


Simplifying
21 + -1(x + 9) = 7x + -4

Reorder the terms:
21 + -1(9 + x) = 7x + -4
21 + (9 * -1 + x * -1) = 7x + -4
21 + (-9 + -1x) = 7x + -4

Combine like terms: 21 + -9 = 12
12 + -1x = 7x + -4

Reorder the terms:
12 + -1x = -4 + 7x

Solving
12 + -1x = -4 + 7x

Solving for variable 'x'.

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

Add '-7x' to each side of the equation.
12 + -1x + -7x = -4 + 7x + -7x

Combine like terms: -1x + -7x = -8x
12 + -8x = -4 + 7x + -7x

Combine like terms: 7x + -7x = 0
12 + -8x = -4 + 0
12 + -8x = -4

Add '-12' to each side of the equation.
12 + -12 + -8x = -4 + -12

Combine like terms: 12 + -12 = 0
0 + -8x = -4 + -12
-8x = -4 + -12

Combine like terms: -4 + -12 = -16
-8x = -16

Divide each side by '-8'.
x = 2

Simplifying
x = 2

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