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Simplifying -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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