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(4x+14)+(5x+31)=90
We move all terms to the left:
(4x+14)+(5x+31)-(90)=0
We get rid of parentheses
4x+5x+14+31-90=0
We add all the numbers together, and all the variables
9x-45=0
We move all terms containing x to the left, all other terms to the right
9x=45
x=45/9
x=5
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