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Simplifying 45 = -3 + -15r + 3r Combine like terms: -15r + 3r = -12r 45 = -3 + -12r Solving 45 = -3 + -12r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '12r' to each side of the equation. 45 + 12r = -3 + -12r + 12r Combine like terms: -12r + 12r = 0 45 + 12r = -3 + 0 45 + 12r = -3 Add '-45' to each side of the equation. 45 + -45 + 12r = -3 + -45 Combine like terms: 45 + -45 = 0 0 + 12r = -3 + -45 12r = -3 + -45 Combine like terms: -3 + -45 = -48 12r = -48 Divide each side by '12'. r = -4 Simplifying r = -4
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