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Simplifying -90 = 5(-2 + 4r) -90 = (-2 * 5 + 4r * 5) -90 = (-10 + 20r) Solving -90 = -10 + 20r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-20r' to each side of the equation. -90 + -20r = -10 + 20r + -20r Combine like terms: 20r + -20r = 0 -90 + -20r = -10 + 0 -90 + -20r = -10 Add '90' to each side of the equation. -90 + 90 + -20r = -10 + 90 Combine like terms: -90 + 90 = 0 0 + -20r = -10 + 90 -20r = -10 + 90 Combine like terms: -10 + 90 = 80 -20r = 80 Divide each side by '-20'. r = -4 Simplifying r = -4
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