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3(5x+4)+30+9x=12x-18+12
We move all terms to the left:
3(5x+4)+30+9x-(12x-18+12)=0
We add all the numbers together, and all the variables
3(5x+4)+9x-(12x-6)+30=0
We add all the numbers together, and all the variables
9x+3(5x+4)-(12x-6)+30=0
We multiply parentheses
9x+15x-(12x-6)+12+30=0
We get rid of parentheses
9x+15x-12x+6+12+30=0
We add all the numbers together, and all the variables
12x+48=0
We move all terms containing x to the left, all other terms to the right
12x=-48
x=-48/12
x=-4
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