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Simplifying 5r + -15 = -12 + 4r Reorder the terms: -15 + 5r = -12 + 4r Solving -15 + 5r = -12 + 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 + 5r + -4r = -12 + 4r + -4r Combine like terms: 5r + -4r = 1r -15 + 1r = -12 + 4r + -4r Combine like terms: 4r + -4r = 0 -15 + 1r = -12 + 0 -15 + 1r = -12 Add '15' to each side of the equation. -15 + 15 + 1r = -12 + 15 Combine like terms: -15 + 15 = 0 0 + 1r = -12 + 15 1r = -12 + 15 Combine like terms: -12 + 15 = 3 1r = 3 Divide each side by '1'. r = 3 Simplifying r = 3
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