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(2x+3)+(3x+223)=90
We move all terms to the left:
(2x+3)+(3x+223)-(90)=0
We get rid of parentheses
2x+3x+3+223-90=0
We add all the numbers together, and all the variables
5x+136=0
We move all terms containing x to the left, all other terms to the right
5x=-136
x=-136/5
x=-27+1/5
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