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Simplifying -3(2r + 4) = -28 + -4r Reorder the terms: -3(4 + 2r) = -28 + -4r (4 * -3 + 2r * -3) = -28 + -4r (-12 + -6r) = -28 + -4r Solving -12 + -6r = -28 + -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. -12 + -6r + 4r = -28 + -4r + 4r Combine like terms: -6r + 4r = -2r -12 + -2r = -28 + -4r + 4r Combine like terms: -4r + 4r = 0 -12 + -2r = -28 + 0 -12 + -2r = -28 Add '12' to each side of the equation. -12 + 12 + -2r = -28 + 12 Combine like terms: -12 + 12 = 0 0 + -2r = -28 + 12 -2r = -28 + 12 Combine like terms: -28 + 12 = -16 -2r = -16 Divide each side by '-2'. r = 8 Simplifying r = 8
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