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0.35r-2=-3.4
We move all terms to the left:
0.35r-2-(-3.4)=0
We add all the numbers together, and all the variables
0.35r+1.4=0
We move all terms containing r to the left, all other terms to the right
0.35r=-1.4
r=-1.4/0.35
r=-4
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