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5(2r-3)=30
We move all terms to the left:
5(2r-3)-(30)=0
We multiply parentheses
10r-15-30=0
We add all the numbers together, and all the variables
10r-45=0
We move all terms containing r to the left, all other terms to the right
10r=45
r=45/10
r=4+1/2
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