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Simplifying 140 = -8(7r + -3) + 4 Reorder the terms: 140 = -8(-3 + 7r) + 4 140 = (-3 * -8 + 7r * -8) + 4 140 = (24 + -56r) + 4 Reorder the terms: 140 = 24 + 4 + -56r Combine like terms: 24 + 4 = 28 140 = 28 + -56r Solving 140 = 28 + -56r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '56r' to each side of the equation. 140 + 56r = 28 + -56r + 56r Combine like terms: -56r + 56r = 0 140 + 56r = 28 + 0 140 + 56r = 28 Add '-140' to each side of the equation. 140 + -140 + 56r = 28 + -140 Combine like terms: 140 + -140 = 0 0 + 56r = 28 + -140 56r = 28 + -140 Combine like terms: 28 + -140 = -112 56r = -112 Divide each side by '56'. r = -2 Simplifying r = -2
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