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(7x+5)+(5x+19)=90
We move all terms to the left:
(7x+5)+(5x+19)-(90)=0
We get rid of parentheses
7x+5x+5+19-90=0
We add all the numbers together, and all the variables
12x-66=0
We move all terms containing x to the left, all other terms to the right
12x=66
x=66/12
x=5+1/2
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