13=3x+-8

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Solution for 13=3x+-8 equation:


Simplifying
13 = 3x + -8

Reorder the terms:
13 = -8 + 3x

Solving
13 = -8 + 3x

Solving for variable 'x'.

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

Add '-3x' to each side of the equation.
13 + -3x = -8 + 3x + -3x

Combine like terms: 3x + -3x = 0
13 + -3x = -8 + 0
13 + -3x = -8

Add '-13' to each side of the equation.
13 + -13 + -3x = -8 + -13

Combine like terms: 13 + -13 = 0
0 + -3x = -8 + -13
-3x = -8 + -13

Combine like terms: -8 + -13 = -21
-3x = -21

Divide each side by '-3'.
x = 7

Simplifying
x = 7

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