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9+120x=3+30x
We move all terms to the left:
9+120x-(3+30x)=0
We add all the numbers together, and all the variables
120x-(30x+3)+9=0
We get rid of parentheses
120x-30x-3+9=0
We add all the numbers together, and all the variables
90x+6=0
We move all terms containing x to the left, all other terms to the right
90x=-6
x=-6/90
x=-1/15
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