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Simplifying 5r + -1(-3r) + -1(-9) = -7 Remove parenthesis around (-3r) 5r + -1 * -3r + -1(-9) = -7 Multiply -1 * -3 5r + 3r + -1(-9) = -7 Multiply -1 * -9 5r + 3r + 9 = -7 Reorder the terms: 9 + 5r + 3r = -7 Combine like terms: 5r + 3r = 8r 9 + 8r = -7 Solving 9 + 8r = -7 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + 8r = -7 + -9 Combine like terms: 9 + -9 = 0 0 + 8r = -7 + -9 8r = -7 + -9 Combine like terms: -7 + -9 = -16 8r = -16 Divide each side by '8'. r = -2 Simplifying r = -2
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