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(84-x)/5=90
We move all terms to the left:
(84-x)/5-(90)=0
We add all the numbers together, and all the variables
(-1x+84)/5-90=0
We multiply all the terms by the denominator
(-1x+84)-90*5=0
We add all the numbers together, and all the variables
(-1x+84)-450=0
We get rid of parentheses
-1x+84-450=0
We add all the numbers together, and all the variables
-1x-366=0
We move all terms containing x to the left, all other terms to the right
-x=366
x=366/-1
x=-366
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