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4=x/20-5
We move all terms to the left:
4-(x/20-5)=0
We get rid of parentheses
-x/20+5+4=0
We multiply all the terms by the denominator
-x+5*20+4*20=0
We add all the numbers together, and all the variables
-1x+180=0
We move all terms containing x to the left, all other terms to the right
-x=-180
x=-180/-1
x=+180
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