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Simplifying -7 + -4r = -3(-7 + -8r) -7 + -4r = (-7 * -3 + -8r * -3) -7 + -4r = (21 + 24r) Solving -7 + -4r = 21 + 24r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-24r' to each side of the equation. -7 + -4r + -24r = 21 + 24r + -24r Combine like terms: -4r + -24r = -28r -7 + -28r = 21 + 24r + -24r Combine like terms: 24r + -24r = 0 -7 + -28r = 21 + 0 -7 + -28r = 21 Add '7' to each side of the equation. -7 + 7 + -28r = 21 + 7 Combine like terms: -7 + 7 = 0 0 + -28r = 21 + 7 -28r = 21 + 7 Combine like terms: 21 + 7 = 28 -28r = 28 Divide each side by '-28'. r = -1 Simplifying r = -1
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