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Simplifying 8 + -7r = 8r + 4(-5 + -2r) 8 + -7r = 8r + (-5 * 4 + -2r * 4) 8 + -7r = 8r + (-20 + -8r) Reorder the terms: 8 + -7r = -20 + 8r + -8r Combine like terms: 8r + -8r = 0 8 + -7r = -20 + 0 8 + -7r = -20 Solving 8 + -7r = -20 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + -7r = -20 + -8 Combine like terms: 8 + -8 = 0 0 + -7r = -20 + -8 -7r = -20 + -8 Combine like terms: -20 + -8 = -28 -7r = -28 Divide each side by '-7'. r = 4 Simplifying r = 4
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