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3x-45+3x+4x+15=125
We move all terms to the left:
3x-45+3x+4x+15-(125)=0
We add all the numbers together, and all the variables
10x-155=0
We move all terms containing x to the left, all other terms to the right
10x=155
x=155/10
x=15+1/2
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