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(4x+5)(85)=x
We move all terms to the left:
(4x+5)(85)-(x)=0
We add all the numbers together, and all the variables
-1x+(4x+5)85=0
We multiply parentheses
-1x+340x+425=0
We add all the numbers together, and all the variables
339x+425=0
We move all terms containing x to the left, all other terms to the right
339x=-425
x=-425/339
x=-1+86/339
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