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10+r=-8+4r
We move all terms to the left:
10+r-(-8+4r)=0
We add all the numbers together, and all the variables
r-(4r-8)+10=0
We get rid of parentheses
r-4r+8+10=0
We add all the numbers together, and all the variables
-3r+18=0
We move all terms containing r to the left, all other terms to the right
-3r=-18
r=-18/-3
r=+6
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