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3(15x+75)=630
We move all terms to the left:
3(15x+75)-(630)=0
We multiply parentheses
45x+225-630=0
We add all the numbers together, and all the variables
45x-405=0
We move all terms containing x to the left, all other terms to the right
45x=405
x=405/45
x=9
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