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Simplifying -5r + 4r + -1(-19r) + -11r + (-9r) = 12 Remove parenthesis around (-19r) -5r + 4r + -1 * -19r + -11r + (-9r) = 12 Multiply -1 * -19 -5r + 4r + 19r + -11r + (-9r) = 12 Combine like terms: -5r + 4r = -1r -1r + 19r + -11r + (-9r) = 12 Combine like terms: -1r + 19r = 18r 18r + -11r + (-9r) = 12 Combine like terms: 18r + -11r = 7r 7r + (-9r) = 12 Combine like terms: 7r + (-9r) = -2r -2r = 12 Solving -2r = 12 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Divide each side by '-2'. r = -6 Simplifying r = -6
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