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Simplifying -3(r + -4) = 56 + -7r Reorder the terms: -3(-4 + r) = 56 + -7r (-4 * -3 + r * -3) = 56 + -7r (12 + -3r) = 56 + -7r Solving 12 + -3r = 56 + -7r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '7r' to each side of the equation. 12 + -3r + 7r = 56 + -7r + 7r Combine like terms: -3r + 7r = 4r 12 + 4r = 56 + -7r + 7r Combine like terms: -7r + 7r = 0 12 + 4r = 56 + 0 12 + 4r = 56 Add '-12' to each side of the equation. 12 + -12 + 4r = 56 + -12 Combine like terms: 12 + -12 = 0 0 + 4r = 56 + -12 4r = 56 + -12 Combine like terms: 56 + -12 = 44 4r = 44 Divide each side by '4'. r = 11 Simplifying r = 11
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