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Simplifying -3(r + 4) = -12 + -4r Reorder the terms: -3(4 + r) = -12 + -4r (4 * -3 + r * -3) = -12 + -4r (-12 + -3r) = -12 + -4r Add '12' to each side of the equation. -12 + 12 + -3r = -12 + 12 + -4r Combine like terms: -12 + 12 = 0 0 + -3r = -12 + 12 + -4r -3r = -12 + 12 + -4r Combine like terms: -12 + 12 = 0 -3r = 0 + -4r -3r = -4r Solving -3r = -4r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '4r' to each side of the equation. -3r + 4r = -4r + 4r Combine like terms: -3r + 4r = 1r 1r = -4r + 4r Combine like terms: -4r + 4r = 0 1r = 0 Divide each side by '1'. r = 0 Simplifying r = 0
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