87-3x=8x+21

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Solution for 87-3x=8x+21 equation:


Simplifying
87 + -3x = 8x + 21

Reorder the terms:
87 + -3x = 21 + 8x

Solving
87 + -3x = 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.
87 + -3x + -8x = 21 + 8x + -8x

Combine like terms: -3x + -8x = -11x
87 + -11x = 21 + 8x + -8x

Combine like terms: 8x + -8x = 0
87 + -11x = 21 + 0
87 + -11x = 21

Add '-87' to each side of the equation.
87 + -87 + -11x = 21 + -87

Combine like terms: 87 + -87 = 0
0 + -11x = 21 + -87
-11x = 21 + -87

Combine like terms: 21 + -87 = -66
-11x = -66

Divide each side by '-11'.
x = 6

Simplifying
x = 6

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