7r-15= r+27
Move +r to the other side. Sign changes from +r to -r.
7r-r-15= r-r+27
6r-15= 27
Move -15 to the other side. Sign changes from -15 to +15
6r-25+15= 27+15
6r= 42
Divide by 6 for 6r and 42
6r/6= 42/6
r= 7
Answer : r= 7
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