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Simplifying 8r + -4 = 15r + -7 Reorder the terms: -4 + 8r = 15r + -7 Reorder the terms: -4 + 8r = -7 + 15r Solving -4 + 8r = -7 + 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. -4 + 8r + -15r = -7 + 15r + -15r Combine like terms: 8r + -15r = -7r -4 + -7r = -7 + 15r + -15r Combine like terms: 15r + -15r = 0 -4 + -7r = -7 + 0 -4 + -7r = -7 Add '4' to each side of the equation. -4 + 4 + -7r = -7 + 4 Combine like terms: -4 + 4 = 0 0 + -7r = -7 + 4 -7r = -7 + 4 Combine like terms: -7 + 4 = -3 -7r = -3 Divide each side by '-7'. r = 0.4285714286 Simplifying r = 0.4285714286
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