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13=18+x/4
We move all terms to the left:
13-(18+x/4)=0
We add all the numbers together, and all the variables
-(x/4+18)+13=0
We get rid of parentheses
-x/4-18+13=0
We multiply all the terms by the denominator
-x-18*4+13*4=0
We add all the numbers together, and all the variables
-1x-20=0
We move all terms containing x to the left, all other terms to the right
-x=20
x=20/-1
x=-20
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