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-5(3-3r)+3(-4r+8)=21
We move all terms to the left:
-5(3-3r)+3(-4r+8)-(21)=0
We add all the numbers together, and all the variables
-5(-3r+3)+3(-4r+8)-21=0
We multiply parentheses
15r-12r-15+24-21=0
We add all the numbers together, and all the variables
3r-12=0
We move all terms containing r to the left, all other terms to the right
3r=12
r=12/3
r=4
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