125-5x=3x+21

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Solution for 125-5x=3x+21 equation:


Simplifying
125 + -5x = 3x + 21

Reorder the terms:
125 + -5x = 21 + 3x

Solving
125 + -5x = 21 + 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.
125 + -5x + -3x = 21 + 3x + -3x

Combine like terms: -5x + -3x = -8x
125 + -8x = 21 + 3x + -3x

Combine like terms: 3x + -3x = 0
125 + -8x = 21 + 0
125 + -8x = 21

Add '-125' to each side of the equation.
125 + -125 + -8x = 21 + -125

Combine like terms: 125 + -125 = 0
0 + -8x = 21 + -125
-8x = 21 + -125

Combine like terms: 21 + -125 = -104
-8x = -104

Divide each side by '-8'.
x = 13

Simplifying
x = 13

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