8x+21=x-7

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Solution for 8x+21=x-7 equation:


Simplifying
8x + 21 = x + -7

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

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

Solving
21 + 8x = -7 + x

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.
21 + 8x + -1x = -7 + x + -1x

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

Combine like terms: x + -1x = 0
21 + 7x = -7 + 0
21 + 7x = -7

Add '-21' to each side of the equation.
21 + -21 + 7x = -7 + -21

Combine like terms: 21 + -21 = 0
0 + 7x = -7 + -21
7x = -7 + -21

Combine like terms: -7 + -21 = -28
7x = -28

Divide each side by '7'.
x = -4

Simplifying
x = -4

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