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3x+3(4x+5)=150
We move all terms to the left:
3x+3(4x+5)-(150)=0
We multiply parentheses
3x+12x+15-150=0
We add all the numbers together, and all the variables
15x-135=0
We move all terms containing x to the left, all other terms to the right
15x=135
x=135/15
x=9
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