3x-15+9x+3=120

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Solution for 3x-15+9x+3=120 equation: 



3x-15+9x+3=120

We move all terms to the left:

3x-15+9x+3-(120)=0

We add all the numbers together, and all the variables

12x-132=0

We move all terms containing x to the left, all other terms to the right

12x=132

x=132/12

x=11

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