109-3x=15x-21

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Solution for 109-3x=15x-21 equation: 


Simplifying
109 + -3x = 15x + -21

Reorder the terms:
109 + -3x = -21 + 15x

Solving
109 + -3x = -21 + 15x

Solving for variable 'x'.

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

Add '-15x' to each side of the equation.
109 + -3x + -15x = -21 + 15x + -15x

Combine like terms: -3x + -15x = -18x
109 + -18x = -21 + 15x + -15x

Combine like terms: 15x + -15x = 0
109 + -18x = -21 + 0
109 + -18x = -21

Add '-109' to each side of the equation.
109 + -109 + -18x = -21 + -109

Combine like terms: 109 + -109 = 0
0 + -18x = -21 + -109
-18x = -21 + -109

Combine like terms: -21 + -109 = -130
-18x = -130

Divide each side by '-18'.
x = 7.222222222

Simplifying
x = 7.222222222

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