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(5x+27)+(45+3x)=90
We move all terms to the left:
(5x+27)+(45+3x)-(90)=0
We add all the numbers together, and all the variables
(5x+27)+(3x+45)-90=0
We get rid of parentheses
5x+3x+27+45-90=0
We add all the numbers together, and all the variables
8x-18=0
We move all terms containing x to the left, all other terms to the right
8x=18
x=18/8
x=2+1/4
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