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Simplifying 15r + -6 + 10 + -3r = 40 Reorder the terms: -6 + 10 + 15r + -3r = 40 Combine like terms: -6 + 10 = 4 4 + 15r + -3r = 40 Combine like terms: 15r + -3r = 12r 4 + 12r = 40 Solving 4 + 12r = 40 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + 12r = 40 + -4 Combine like terms: 4 + -4 = 0 0 + 12r = 40 + -4 12r = 40 + -4 Combine like terms: 40 + -4 = 36 12r = 36 Divide each side by '12'. r = 3 Simplifying r = 3
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