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6(2r-5)=-12
We move all terms to the left:
6(2r-5)-(-12)=0
We add all the numbers together, and all the variables
6(2r-5)+12=0
We multiply parentheses
12r-30+12=0
We add all the numbers together, and all the variables
12r-18=0
We move all terms containing r to the left, all other terms to the right
12r=18
r=18/12
r=1+1/2
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