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3(x+3)=4x-30
We move all terms to the left:
3(x+3)-(4x-30)=0
We multiply parentheses
3x-(4x-30)+9=0
We get rid of parentheses
3x-4x+30+9=0
We add all the numbers together, and all the variables
-1x+39=0
We move all terms containing x to the left, all other terms to the right
-x=-39
x=-39/-1
x=+39
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