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Simplifying 13 = 4(-7r + -3) + -2r Reorder the terms: 13 = 4(-3 + -7r) + -2r 13 = (-3 * 4 + -7r * 4) + -2r 13 = (-12 + -28r) + -2r Combine like terms: -28r + -2r = -30r 13 = -12 + -30r Solving 13 = -12 + -30r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '30r' to each side of the equation. 13 + 30r = -12 + -30r + 30r Combine like terms: -30r + 30r = 0 13 + 30r = -12 + 0 13 + 30r = -12 Add '-13' to each side of the equation. 13 + -13 + 30r = -12 + -13 Combine like terms: 13 + -13 = 0 0 + 30r = -12 + -13 30r = -12 + -13 Combine like terms: -12 + -13 = -25 30r = -25 Divide each side by '30'. r = -0.8333333333 Simplifying r = -0.8333333333
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