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Simplifying 8 + -3r = -4 + -15r Solving 8 + -3r = -4 + -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. 8 + -3r + 15r = -4 + -15r + 15r Combine like terms: -3r + 15r = 12r 8 + 12r = -4 + -15r + 15r Combine like terms: -15r + 15r = 0 8 + 12r = -4 + 0 8 + 12r = -4 Add '-8' to each side of the equation. 8 + -8 + 12r = -4 + -8 Combine like terms: 8 + -8 = 0 0 + 12r = -4 + -8 12r = -4 + -8 Combine like terms: -4 + -8 = -12 12r = -12 Divide each side by '12'. r = -1 Simplifying r = -1
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