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Simplifying 8r + -1 = 15r + -15 Reorder the terms: -1 + 8r = 15r + -15 Reorder the terms: -1 + 8r = -15 + 15r Solving -1 + 8r = -15 + 15r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-15r' to each side of the equation. -1 + 8r + -15r = -15 + 15r + -15r Combine like terms: 8r + -15r = -7r -1 + -7r = -15 + 15r + -15r Combine like terms: 15r + -15r = 0 -1 + -7r = -15 + 0 -1 + -7r = -15 Add '1' to each side of the equation. -1 + 1 + -7r = -15 + 1 Combine like terms: -1 + 1 = 0 0 + -7r = -15 + 1 -7r = -15 + 1 Combine like terms: -15 + 1 = -14 -7r = -14 Divide each side by '-7'. r = 2 Simplifying r = 2
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