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Simplifying -1.5(4 + -1r) = -12 (4 * -1.5 + -1r * -1.5) = -12 (-6 + 1.5r) = -12 Solving -6 + 1.5r = -12 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + 1.5r = -12 + 6 Combine like terms: -6 + 6 = 0 0 + 1.5r = -12 + 6 1.5r = -12 + 6 Combine like terms: -12 + 6 = -6 1.5r = -6 Divide each side by '1.5'. r = -4 Simplifying r = -4
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