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6.2=-0.4r
We move all terms to the left:
6.2-(-0.4r)=0
We get rid of parentheses
0.4r+6.2=0
We move all terms containing r to the left, all other terms to the right
0.4r=-6.2
r=-6.2/0.4
r=-15+0.2/0.4
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