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7.5+2.5(1-3.5r)=19.5
We move all terms to the left:
7.5+2.5(1-3.5r)-(19.5)=0
We add all the numbers together, and all the variables
2.5(-3.5r+1)+7.5-(19.5)=0
We add all the numbers together, and all the variables
2.5(-3.5r+1)-12=0
We multiply parentheses
-7.5r+2.5-12=0
We add all the numbers together, and all the variables
-7.5r-9.5=0
We move all terms containing r to the left, all other terms to the right
-7.5r=9.5
r=9.5/-7.5
r=-1+2/7.5
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