3x+13=4x-8

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Solution for 3x+13=4x-8 equation:


Simplifying
3x + 13 = 4x + -8

Reorder the terms:
13 + 3x = 4x + -8

Reorder the terms:
13 + 3x = -8 + 4x

Solving
13 + 3x = -8 + 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.
13 + 3x + -4x = -8 + 4x + -4x

Combine like terms: 3x + -4x = -1x
13 + -1x = -8 + 4x + -4x

Combine like terms: 4x + -4x = 0
13 + -1x = -8 + 0
13 + -1x = -8

Add '-13' to each side of the equation.
13 + -13 + -1x = -8 + -13

Combine like terms: 13 + -13 = 0
0 + -1x = -8 + -13
-1x = -8 + -13

Combine like terms: -8 + -13 = -21
-1x = -21

Divide each side by '-1'.
x = 21

Simplifying
x = 21

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