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Simplifying -4(r + 3) = 45 Reorder the terms: -4(3 + r) = 45 (3 * -4 + r * -4) = 45 (-12 + -4r) = 45 Solving -12 + -4r = 45 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 + -4r = 45 + 12 Combine like terms: -12 + 12 = 0 0 + -4r = 45 + 12 -4r = 45 + 12 Combine like terms: 45 + 12 = 57 -4r = 57 Divide each side by '-4'. r = -14.25 Simplifying r = -14.25
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