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3x+30(x-7)=615
We move all terms to the left:
3x+30(x-7)-(615)=0
We multiply parentheses
3x+30x-210-615=0
We add all the numbers together, and all the variables
33x-825=0
We move all terms containing x to the left, all other terms to the right
33x=825
x=825/33
x=25
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