4-21=8x-9-7x

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Solution for 4-21=8x-9-7x equation:


Simplifying
4 + -21 = 8x + -9 + -7x

Combine like terms: 4 + -21 = -17
-17 = 8x + -9 + -7x

Reorder the terms:
-17 = -9 + 8x + -7x

Combine like terms: 8x + -7x = 1x
-17 = -9 + 1x

Solving
-17 = -9 + 1x

Solving for variable 'x'.

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

Add '-1x' to each side of the equation.
-17 + -1x = -9 + 1x + -1x

Combine like terms: 1x + -1x = 0
-17 + -1x = -9 + 0
-17 + -1x = -9

Add '17' to each side of the equation.
-17 + 17 + -1x = -9 + 17

Combine like terms: -17 + 17 = 0
0 + -1x = -9 + 17
-1x = -9 + 17

Combine like terms: -9 + 17 = 8
-1x = 8

Divide each side by '-1'.
x = -8

Simplifying
x = -8

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