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18(4x-5)+21=17x-19
We move all terms to the left:
18(4x-5)+21-(17x-19)=0
We multiply parentheses
72x-(17x-19)-90+21=0
We get rid of parentheses
72x-17x+19-90+21=0
We add all the numbers together, and all the variables
55x-50=0
We move all terms containing x to the left, all other terms to the right
55x=50
x=50/55
x=10/11
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