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81=x/30*5
We move all terms to the left:
81-(x/30*5)=0
We add all the numbers together, and all the variables
-(+x/30*5)+81=0
We get rid of parentheses
-x/30*5+81=0
We multiply all the terms by the denominator
-x+81*30*5=0
We add all the numbers together, and all the variables
-1x+12150=0
We move all terms containing x to the left, all other terms to the right
-x=-12150
x=-12150/-1
x=+12150
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