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(14x-19)+(4x+55)=90
We move all terms to the left:
(14x-19)+(4x+55)-(90)=0
We get rid of parentheses
14x+4x-19+55-90=0
We add all the numbers together, and all the variables
18x-54=0
We move all terms containing x to the left, all other terms to the right
18x=54
x=54/18
x=3
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