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(19x-13)+(6x-7)=90
We move all terms to the left:
(19x-13)+(6x-7)-(90)=0
We get rid of parentheses
19x+6x-13-7-90=0
We add all the numbers together, and all the variables
25x-110=0
We move all terms containing x to the left, all other terms to the right
25x=110
x=110/25
x=4+2/5
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