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Simplifying 12r + 13 = -3r Reorder the terms: 13 + 12r = -3r Solving 13 + 12r = -3r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '3r' to each side of the equation. 13 + 12r + 3r = -3r + 3r Combine like terms: 12r + 3r = 15r 13 + 15r = -3r + 3r Combine like terms: -3r + 3r = 0 13 + 15r = 0 Add '-13' to each side of the equation. 13 + -13 + 15r = 0 + -13 Combine like terms: 13 + -13 = 0 0 + 15r = 0 + -13 15r = 0 + -13 Combine like terms: 0 + -13 = -13 15r = -13 Divide each side by '15'. r = -0.8666666667 Simplifying r = -0.8666666667
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