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12x+36+3x-72=8x+30+4x+150
We move all terms to the left:
12x+36+3x-72-(8x+30+4x+150)=0
We add all the numbers together, and all the variables
12x+3x-(12x+180)+36-72=0
We add all the numbers together, and all the variables
15x-(12x+180)-36=0
We get rid of parentheses
15x-12x-180-36=0
We add all the numbers together, and all the variables
3x-216=0
We move all terms containing x to the left, all other terms to the right
3x=216
x=216/3
x=72
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