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Simplifying -1r + -1(-9r) + -20 = -4 Remove parenthesis around (-9r) -1r + -1 * -9r + -20 = -4 Multiply -1 * -9 -1r + 9r + -20 = -4 Reorder the terms: -20 + -1r + 9r = -4 Combine like terms: -1r + 9r = 8r -20 + 8r = -4 Solving -20 + 8r = -4 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + 8r = -4 + 20 Combine like terms: -20 + 20 = 0 0 + 8r = -4 + 20 8r = -4 + 20 Combine like terms: -4 + 20 = 16 8r = 16 Divide each side by '8'. r = 2 Simplifying r = 2
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