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Simplifying 9r + -19r + 11r + -4 = 13 Reorder the terms: -4 + 9r + -19r + 11r = 13 Combine like terms: 9r + -19r = -10r -4 + -10r + 11r = 13 Combine like terms: -10r + 11r = 1r -4 + 1r = 13 Solving -4 + 1r = 13 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + 1r = 13 + 4 Combine like terms: -4 + 4 = 0 0 + 1r = 13 + 4 1r = 13 + 4 Combine like terms: 13 + 4 = 17 1r = 17 Divide each side by '1'. r = 17 Simplifying r = 17
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