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(4x+2)+(8x+5)=55
We move all terms to the left:
(4x+2)+(8x+5)-(55)=0
We get rid of parentheses
4x+8x+2+5-55=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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