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(4x+3)+(8x+10)=90
We move all terms to the left:
(4x+3)+(8x+10)-(90)=0
We get rid of parentheses
4x+8x+3+10-90=0
We add all the numbers together, and all the variables
12x-77=0
We move all terms containing x to the left, all other terms to the right
12x=77
x=77/12
x=6+5/12
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