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75=3.14r+4r/2
We move all terms to the left:
75-(3.14r+4r/2)=0
We add all the numbers together, and all the variables
-(+3.14r+4r/2)+75=0
We get rid of parentheses
-3.14r-4r/2+75=0
We multiply all the terms by the denominator
-(3.14r)*2-4r+75*2=0
We add all the numbers together, and all the variables
-(+3.14r)*2-4r+75*2=0
We add all the numbers together, and all the variables
-4r-(+3.14r)*2+150=0
We multiply parentheses
-4r-6r+150=0
We add all the numbers together, and all the variables
-10r+150=0
We move all terms containing r to the left, all other terms to the right
-10r=-150
r=-150/-10
r=+15
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