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Simplifying -3 + -4(r + -4) = 13 + -1r Reorder the terms: -3 + -4(-4 + r) = 13 + -1r -3 + (-4 * -4 + r * -4) = 13 + -1r -3 + (16 + -4r) = 13 + -1r Combine like terms: -3 + 16 = 13 13 + -4r = 13 + -1r Add '-13' to each side of the equation. 13 + -13 + -4r = 13 + -13 + -1r Combine like terms: 13 + -13 = 0 0 + -4r = 13 + -13 + -1r -4r = 13 + -13 + -1r Combine like terms: 13 + -13 = 0 -4r = 0 + -1r -4r = -1r Solving -4r = -1r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add 'r' to each side of the equation. -4r + r = -1r + r Combine like terms: -4r + r = -3r -3r = -1r + r Combine like terms: -1r + r = 0 -3r = 0 Divide each side by '-3'. r = 0 Simplifying r = 0
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