Solve for r
r\leq -0.9
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-r\geq 0.9
Swap sides so that all variable terms are on the left hand side. This changes the sign direction.
r\leq \frac{0.9}{-1}
Divide both sides by -1. Since -1 is negative, the inequality direction is changed.
r\leq \frac{9}{-10}
Expand \frac{0.9}{-1} by multiplying both numerator and the denominator by 10.
r\leq -\frac{9}{10}
Fraction \frac{9}{-10} can be rewritten as -\frac{9}{10} by extracting the negative sign.
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