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(8x)+(21x-12)+(10x+9)+90=360
We move all terms to the left:
(8x)+(21x-12)+(10x+9)+90-(360)=0
We add all the numbers together, and all the variables
8x+(21x-12)+(10x+9)-270=0
We get rid of parentheses
8x+21x+10x-12+9-270=0
We add all the numbers together, and all the variables
39x-273=0
We move all terms containing x to the left, all other terms to the right
39x=273
x=273/39
x=7
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