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Simplifying -3r + r + -15 = 3 Reorder the terms: -15 + -3r + r = 3 Combine like terms: -3r + r = -2r -15 + -2r = 3 Solving -15 + -2r = 3 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + -2r = 3 + 15 Combine like terms: -15 + 15 = 0 0 + -2r = 3 + 15 -2r = 3 + 15 Combine like terms: 3 + 15 = 18 -2r = 18 Divide each side by '-2'. r = -9 Simplifying r = -9
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