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(5x+2)+(3x+5)+(8x+8)+(5x+10)+(4x+15)=720
We move all terms to the left:
(5x+2)+(3x+5)+(8x+8)+(5x+10)+(4x+15)-(720)=0
We get rid of parentheses
5x+3x+8x+5x+4x+2+5+8+10+15-720=0
We add all the numbers together, and all the variables
25x-680=0
We move all terms containing x to the left, all other terms to the right
25x=680
x=680/25
x=27+1/5
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