87-4x=21

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Solution for 87-4x=21 equation: 


Simplifying
87 + -4x = 21

Solving
87 + -4x = 21

Solving for variable 'x'.

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

Add '-87' to each side of the equation.
87 + -87 + -4x = 21 + -87

Combine like terms: 87 + -87 = 0
0 + -4x = 21 + -87
-4x = 21 + -87

Combine like terms: 21 + -87 = -66
-4x = -66

Divide each side by '-4'.
x = 16.5

Simplifying
x = 16.5

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