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Simplifying -4(r + 3) = -78 Reorder the terms: -4(3 + r) = -78 (3 * -4 + r * -4) = -78 (-12 + -4r) = -78 Solving -12 + -4r = -78 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 = -78 + 12 Combine like terms: -12 + 12 = 0 0 + -4r = -78 + 12 -4r = -78 + 12 Combine like terms: -78 + 12 = -66 -4r = -66 Divide each side by '-4'. r = 16.5 Simplifying r = 16.5
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