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-6(3r-5)+28r=40
We move all terms to the left:
-6(3r-5)+28r-(40)=0
We add all the numbers together, and all the variables
28r-6(3r-5)-40=0
We multiply parentheses
28r-18r+30-40=0
We add all the numbers together, and all the variables
10r-10=0
We move all terms containing r to the left, all other terms to the right
10r=10
r=10/10
r=1
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