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(8x-5)+(10x-4)=90
We move all terms to the left:
(8x-5)+(10x-4)-(90)=0
We get rid of parentheses
8x+10x-5-4-90=0
We add all the numbers together, and all the variables
18x-99=0
We move all terms containing x to the left, all other terms to the right
18x=99
x=99/18
x=5+1/2
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