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Simplifying 8(r + -2) + 7r = -91 Reorder the terms: 8(-2 + r) + 7r = -91 (-2 * 8 + r * 8) + 7r = -91 (-16 + 8r) + 7r = -91 Combine like terms: 8r + 7r = 15r -16 + 15r = -91 Solving -16 + 15r = -91 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '16' to each side of the equation. -16 + 16 + 15r = -91 + 16 Combine like terms: -16 + 16 = 0 0 + 15r = -91 + 16 15r = -91 + 16 Combine like terms: -91 + 16 = -75 15r = -75 Divide each side by '15'. r = -5 Simplifying r = -5
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