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Simplifying 3r + 15 = 4r Reorder the terms: 15 + 3r = 4r Solving 15 + 3r = 4r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-4r' to each side of the equation. 15 + 3r + -4r = 4r + -4r Combine like terms: 3r + -4r = -1r 15 + -1r = 4r + -4r Combine like terms: 4r + -4r = 0 15 + -1r = 0 Add '-15' to each side of the equation. 15 + -15 + -1r = 0 + -15 Combine like terms: 15 + -15 = 0 0 + -1r = 0 + -15 -1r = 0 + -15 Combine like terms: 0 + -15 = -15 -1r = -15 Divide each side by '-1'. r = 15 Simplifying r = 15
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