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Simplifying -4 + 5(-2r) + -81 = 0 Remove parenthesis around (-2r) -4 + 5 * -2r + -81 = 0 Multiply 5 * -2 -4 + -10r + -81 = 0 Reorder the terms: -4 + -81 + -10r = 0 Combine like terms: -4 + -81 = -85 -85 + -10r = 0 Solving -85 + -10r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '85' to each side of the equation. -85 + 85 + -10r = 0 + 85 Combine like terms: -85 + 85 = 0 0 + -10r = 0 + 85 -10r = 0 + 85 Combine like terms: 0 + 85 = 85 -10r = 85 Divide each side by '-10'. r = -8.5 Simplifying r = -8.5
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