3x+21=13x-79

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Solution for 3x+21=13x-79 equation:


Simplifying
3x + 21 = 13x + -79

Reorder the terms:
21 + 3x = 13x + -79

Reorder the terms:
21 + 3x = -79 + 13x

Solving
21 + 3x = -79 + 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 + 3x + -13x = -79 + 13x + -13x

Combine like terms: 3x + -13x = -10x
21 + -10x = -79 + 13x + -13x

Combine like terms: 13x + -13x = 0
21 + -10x = -79 + 0
21 + -10x = -79

Add '-21' to each side of the equation.
21 + -21 + -10x = -79 + -21

Combine like terms: 21 + -21 = 0
0 + -10x = -79 + -21
-10x = -79 + -21

Combine like terms: -79 + -21 = -100
-10x = -100

Divide each side by '-10'.
x = 10

Simplifying
x = 10

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