Solve for r

r=-\frac{3}{7}\approx -0.428571429

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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.