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7+4r-2=10+
We move all terms to the left:
7+4r-2-(10+)=0
We add all the numbers together, and all the variables
4r+7-2-0=0
We add all the numbers together, and all the variables
4r+5=0
We move all terms containing r to the left, all other terms to the right
4r=-5
r=-5/4
r=-1+1/4
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