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Simplifying 5(r + 4) + -7r = -16 Reorder the terms: 5(4 + r) + -7r = -16 (4 * 5 + r * 5) + -7r = -16 (20 + 5r) + -7r = -16 Combine like terms: 5r + -7r = -2r 20 + -2r = -16 Solving 20 + -2r = -16 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 + -2r = -16 + -20 Combine like terms: 20 + -20 = 0 0 + -2r = -16 + -20 -2r = -16 + -20 Combine like terms: -16 + -20 = -36 -2r = -36 Divide each side by '-2'. r = 18 Simplifying r = 18
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