87-3x=15x+21

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Solution for 87-3x=15x+21 equation:


Simplifying
87 + -3x = 15x + 21

Reorder the terms:
87 + -3x = 21 + 15x

Solving
87 + -3x = 21 + 15x

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-15x' to each side of the equation.
87 + -3x + -15x = 21 + 15x + -15x

Combine like terms: -3x + -15x = -18x
87 + -18x = 21 + 15x + -15x

Combine like terms: 15x + -15x = 0
87 + -18x = 21 + 0
87 + -18x = 21

Add '-87' to each side of the equation.
87 + -87 + -18x = 21 + -87

Combine like terms: 87 + -87 = 0
0 + -18x = 21 + -87
-18x = 21 + -87

Combine like terms: 21 + -87 = -66
-18x = -66

Divide each side by '-18'.
x = 3.666666667

Simplifying
x = 3.666666667

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