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5(2r+14)=180
We move all terms to the left:
5(2r+14)-(180)=0
We multiply parentheses
10r+70-180=0
We add all the numbers together, and all the variables
10r-110=0
We move all terms containing r to the left, all other terms to the right
10r=110
r=110/10
r=11
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