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Simplifying -7r + -7(4r + -3) = 56 Reorder the terms: -7r + -7(-3 + 4r) = 56 -7r + (-3 * -7 + 4r * -7) = 56 -7r + (21 + -28r) = 56 Reorder the terms: 21 + -7r + -28r = 56 Combine like terms: -7r + -28r = -35r 21 + -35r = 56 Solving 21 + -35r = 56 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + -35r = 56 + -21 Combine like terms: 21 + -21 = 0 0 + -35r = 56 + -21 -35r = 56 + -21 Combine like terms: 56 + -21 = 35 -35r = 35 Divide each side by '-35'. r = -1 Simplifying r = -1
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