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Simplifying 15 + 4r = 36 + -3r Solving 15 + 4r = 36 + -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. 15 + 4r + 3r = 36 + -3r + 3r Combine like terms: 4r + 3r = 7r 15 + 7r = 36 + -3r + 3r Combine like terms: -3r + 3r = 0 15 + 7r = 36 + 0 15 + 7r = 36 Add '-15' to each side of the equation. 15 + -15 + 7r = 36 + -15 Combine like terms: 15 + -15 = 0 0 + 7r = 36 + -15 7r = 36 + -15 Combine like terms: 36 + -15 = 21 7r = 21 Divide each side by '7'. r = 3 Simplifying r = 3
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