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Simplifying -3r + -4r + -12 = 7 Reorder the terms: -12 + -3r + -4r = 7 Combine like terms: -3r + -4r = -7r -12 + -7r = 7 Solving -12 + -7r = 7 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + -7r = 7 + 12 Combine like terms: -12 + 12 = 0 0 + -7r = 7 + 12 -7r = 7 + 12 Combine like terms: 7 + 12 = 19 -7r = 19 Divide each side by '-7'. r = -2.714285714 Simplifying r = -2.714285714
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