8x-21=-9(x+8)

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


Simplifying
8x + -21 = -9(x + 8)

Reorder the terms:
-21 + 8x = -9(x + 8)

Reorder the terms:
-21 + 8x = -9(8 + x)
-21 + 8x = (8 * -9 + x * -9)
-21 + 8x = (-72 + -9x)

Solving
-21 + 8x = -72 + -9x

Solving for variable 'x'.

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

Add '9x' to each side of the equation.
-21 + 8x + 9x = -72 + -9x + 9x

Combine like terms: 8x + 9x = 17x
-21 + 17x = -72 + -9x + 9x

Combine like terms: -9x + 9x = 0
-21 + 17x = -72 + 0
-21 + 17x = -72

Add '21' to each side of the equation.
-21 + 21 + 17x = -72 + 21

Combine like terms: -21 + 21 = 0
0 + 17x = -72 + 21
17x = -72 + 21

Combine like terms: -72 + 21 = -51
17x = -51

Divide each side by '17'.
x = -3

Simplifying
x = -3

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