21-3x=4x+84

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Solution for 21-3x=4x+84 equation:


Simplifying
21 + -3x = 4x + 84

Reorder the terms:
21 + -3x = 84 + 4x

Solving
21 + -3x = 84 + 4x

Solving for variable 'x'.

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

Add '-4x' to each side of the equation.
21 + -3x + -4x = 84 + 4x + -4x

Combine like terms: -3x + -4x = -7x
21 + -7x = 84 + 4x + -4x

Combine like terms: 4x + -4x = 0
21 + -7x = 84 + 0
21 + -7x = 84

Add '-21' to each side of the equation.
21 + -21 + -7x = 84 + -21

Combine like terms: 21 + -21 = 0
0 + -7x = 84 + -21
-7x = 84 + -21

Combine like terms: 84 + -21 = 63
-7x = 63

Divide each side by '-7'.
x = -9

Simplifying
x = -9

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