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Simplifying 3r + -15 = -3 + 7r Reorder the terms: -15 + 3r = -3 + 7r Solving -15 + 3r = -3 + 7r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-7r' to each side of the equation. -15 + 3r + -7r = -3 + 7r + -7r Combine like terms: 3r + -7r = -4r -15 + -4r = -3 + 7r + -7r Combine like terms: 7r + -7r = 0 -15 + -4r = -3 + 0 -15 + -4r = -3 Add '15' to each side of the equation. -15 + 15 + -4r = -3 + 15 Combine like terms: -15 + 15 = 0 0 + -4r = -3 + 15 -4r = -3 + 15 Combine like terms: -3 + 15 = 12 -4r = 12 Divide each side by '-4'. r = -3 Simplifying r = -3
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