4x+21=13x-87

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Solution for 4x+21=13x-87 equation:


Simplifying
4x + 21 = 13x + -87

Reorder the terms:
21 + 4x = 13x + -87

Reorder the terms:
21 + 4x = -87 + 13x

Solving
21 + 4x = -87 + 13x

Solving for variable 'x'.

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

Add '-13x' to each side of the equation.
21 + 4x + -13x = -87 + 13x + -13x

Combine like terms: 4x + -13x = -9x
21 + -9x = -87 + 13x + -13x

Combine like terms: 13x + -13x = 0
21 + -9x = -87 + 0
21 + -9x = -87

Add '-21' to each side of the equation.
21 + -21 + -9x = -87 + -21

Combine like terms: 21 + -21 = 0
0 + -9x = -87 + -21
-9x = -87 + -21

Combine like terms: -87 + -21 = -108
-9x = -108

Divide each side by '-9'.
x = 12

Simplifying
x = 12

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