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(12x+5)+37=90
We move all terms to the left:
(12x+5)+37-(90)=0
We add all the numbers together, and all the variables
(12x+5)-53=0
We get rid of parentheses
12x+5-53=0
We add all the numbers together, and all the variables
12x-48=0
We move all terms containing x to the left, all other terms to the right
12x=48
x=48/12
x=4
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