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(7x+23)+(3x+27)=90
We move all terms to the left:
(7x+23)+(3x+27)-(90)=0
We get rid of parentheses
7x+3x+23+27-90=0
We add all the numbers together, and all the variables
10x-40=0
We move all terms containing x to the left, all other terms to the right
10x=40
x=40/10
x=4
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