8x-63=x+21

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Solution for 8x-63=x+21 equation:


Simplifying
8x + -63 = x + 21

Reorder the terms:
-63 + 8x = x + 21

Reorder the terms:
-63 + 8x = 21 + x

Solving
-63 + 8x = 21 + 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.
-63 + 8x + -1x = 21 + x + -1x

Combine like terms: 8x + -1x = 7x
-63 + 7x = 21 + x + -1x

Combine like terms: x + -1x = 0
-63 + 7x = 21 + 0
-63 + 7x = 21

Add '63' to each side of the equation.
-63 + 63 + 7x = 21 + 63

Combine like terms: -63 + 63 = 0
0 + 7x = 21 + 63
7x = 21 + 63

Combine like terms: 21 + 63 = 84
7x = 84

Divide each side by '7'.
x = 12

Simplifying
x = 12

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