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Simplifying -1r + 4(-9r + -4) = 0 Reorder the terms: -1r + 4(-4 + -9r) = 0 -1r + (-4 * 4 + -9r * 4) = 0 -1r + (-16 + -36r) = 0 Reorder the terms: -16 + -1r + -36r = 0 Combine like terms: -1r + -36r = -37r -16 + -37r = 0 Solving -16 + -37r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '16' to each side of the equation. -16 + 16 + -37r = 0 + 16 Combine like terms: -16 + 16 = 0 0 + -37r = 0 + 16 -37r = 0 + 16 Combine like terms: 0 + 16 = 16 -37r = 16 Divide each side by '-37'. r = -0.4324324324 Simplifying r = -0.4324324324
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