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(5x+4)+(16x-5)=90
We move all terms to the left:
(5x+4)+(16x-5)-(90)=0
We get rid of parentheses
5x+16x+4-5-90=0
We add all the numbers together, and all the variables
21x-91=0
We move all terms containing x to the left, all other terms to the right
21x=91
x=91/21
x=4+1/3
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