Solve for r
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r-3=8r
Multiply both sides of the equation by 4.
r-3-8r=0
Subtract 8r from both sides.
-7r-3=0
Combine r and -8r to get -7r.
-7r=3
Add 3 to both sides. Anything plus zero gives itself.
r=\frac{3}{-7}
Divide both sides by -7.
r=-\frac{3}{7}
Fraction \frac{3}{-7} can be rewritten as -\frac{3}{7} by extracting the negative sign.