-84-7x=8x+21

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Solution for -84-7x=8x+21 equation:


Simplifying
-84 + -7x = 8x + 21

Reorder the terms:
-84 + -7x = 21 + 8x

Solving
-84 + -7x = 21 + 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.
-84 + -7x + -8x = 21 + 8x + -8x

Combine like terms: -7x + -8x = -15x
-84 + -15x = 21 + 8x + -8x

Combine like terms: 8x + -8x = 0
-84 + -15x = 21 + 0
-84 + -15x = 21

Add '84' to each side of the equation.
-84 + 84 + -15x = 21 + 84

Combine like terms: -84 + 84 = 0
0 + -15x = 21 + 84
-15x = 21 + 84

Combine like terms: 21 + 84 = 105
-15x = 105

Divide each side by '-15'.
x = -7

Simplifying
x = -7

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