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(5x-47)+(4x+2)=90
We move all terms to the left:
(5x-47)+(4x+2)-(90)=0
We get rid of parentheses
5x+4x-47+2-90=0
We add all the numbers together, and all the variables
9x-135=0
We move all terms containing x to the left, all other terms to the right
9x=135
x=135/9
x=15
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