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Simplifying 8r + 7 = 18r + 15 Reorder the terms: 7 + 8r = 18r + 15 Reorder the terms: 7 + 8r = 15 + 18r Solving 7 + 8r = 15 + 18r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-18r' to each side of the equation. 7 + 8r + -18r = 15 + 18r + -18r Combine like terms: 8r + -18r = -10r 7 + -10r = 15 + 18r + -18r Combine like terms: 18r + -18r = 0 7 + -10r = 15 + 0 7 + -10r = 15 Add '-7' to each side of the equation. 7 + -7 + -10r = 15 + -7 Combine like terms: 7 + -7 = 0 0 + -10r = 15 + -7 -10r = 15 + -7 Combine like terms: 15 + -7 = 8 -10r = 8 Divide each side by '-10'. r = -0.8 Simplifying r = -0.8
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