x-21=8x-7

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


Simplifying
x + -21 = 8x + -7

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

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

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

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

Combine like terms: 8x + -8x = 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 = 14
-7x = 14

Divide each side by '-7'.
x = -2

Simplifying
x = -2

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