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3x+9x+18=4x+50
We move all terms to the left:
3x+9x+18-(4x+50)=0
We add all the numbers together, and all the variables
12x-(4x+50)+18=0
We get rid of parentheses
12x-4x-50+18=0
We add all the numbers together, and all the variables
8x-32=0
We move all terms containing x to the left, all other terms to the right
8x=32
x=32/8
x=4
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