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(2x+43)+(3x+12)=90
We move all terms to the left:
(2x+43)+(3x+12)-(90)=0
We get rid of parentheses
2x+3x+43+12-90=0
We add all the numbers together, and all the variables
5x-35=0
We move all terms containing x to the left, all other terms to the right
5x=35
x=35/5
x=7
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