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Simplifying 8r + -18 = -15 + 7r Reorder the terms: -18 + 8r = -15 + 7r Solving -18 + 8r = -15 + 7r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-7r' to each side of the equation. -18 + 8r + -7r = -15 + 7r + -7r Combine like terms: 8r + -7r = 1r -18 + 1r = -15 + 7r + -7r Combine like terms: 7r + -7r = 0 -18 + 1r = -15 + 0 -18 + 1r = -15 Add '18' to each side of the equation. -18 + 18 + 1r = -15 + 18 Combine like terms: -18 + 18 = 0 0 + 1r = -15 + 18 1r = -15 + 18 Combine like terms: -15 + 18 = 3 1r = 3 Divide each side by '1'. r = 3 Simplifying r = 3
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