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Simplifying (r + -4) + -1(4r + 4) = 0 Reorder the terms: (-4 + r) + -1(4r + 4) = 0 Remove parenthesis around (-4 + r) -4 + r + -1(4r + 4) = 0 Reorder the terms: -4 + r + -1(4 + 4r) = 0 -4 + r + (4 * -1 + 4r * -1) = 0 -4 + r + (-4 + -4r) = 0 Reorder the terms: -4 + -4 + r + -4r = 0 Combine like terms: -4 + -4 = -8 -8 + r + -4r = 0 Combine like terms: r + -4r = -3r -8 + -3r = 0 Solving -8 + -3r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + -3r = 0 + 8 Combine like terms: -8 + 8 = 0 0 + -3r = 0 + 8 -3r = 0 + 8 Combine like terms: 0 + 8 = 8 -3r = 8 Divide each side by '-3'. r = -2.666666667 Simplifying r = -2.666666667
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