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18-x/5=20
We move all terms to the left:
18-x/5-(20)=0
We add all the numbers together, and all the variables
-x/5-2=0
We multiply all the terms by the denominator
-x-2*5=0
We add all the numbers together, and all the variables
-1x-10=0
We move all terms containing x to the left, all other terms to the right
-x=10
x=10/-1
x=-10
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