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-12(r+4)=-10r+30
We move all terms to the left:
-12(r+4)-(-10r+30)=0
We multiply parentheses
-12r-(-10r+30)-48=0
We get rid of parentheses
-12r+10r-30-48=0
We add all the numbers together, and all the variables
-2r-78=0
We move all terms containing r to the left, all other terms to the right
-2r=78
r=78/-2
r=-39
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