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Simplifying -5 + -1(7 + -4r) = 0 -5 + (7 * -1 + -4r * -1) = 0 -5 + (-7 + 4r) = 0 Combine like terms: -5 + -7 = -12 -12 + 4r = 0 Solving -12 + 4r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + 4r = 0 + 12 Combine like terms: -12 + 12 = 0 0 + 4r = 0 + 12 4r = 0 + 12 Combine like terms: 0 + 12 = 12 4r = 12 Divide each side by '4'. r = 3 Simplifying r = 3
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