15x+45x=120

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Solution for 15x+45x=120 equation: 


Simplifying
15x + 45x = 120

Combine like terms: 15x + 45x = 60x
60x = 120

Solving
60x = 120

Solving for variable 'x'.

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

Divide each side by '60'.
x = 2

Simplifying
x = 2

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