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Simplifying -2r + 4 = 4(1 + -9r) Reorder the terms: 4 + -2r = 4(1 + -9r) 4 + -2r = (1 * 4 + -9r * 4) 4 + -2r = (4 + -36r) Add '-4' to each side of the equation. 4 + -4 + -2r = 4 + -4 + -36r Combine like terms: 4 + -4 = 0 0 + -2r = 4 + -4 + -36r -2r = 4 + -4 + -36r Combine like terms: 4 + -4 = 0 -2r = 0 + -36r -2r = -36r Solving -2r = -36r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '36r' to each side of the equation. -2r + 36r = -36r + 36r Combine like terms: -2r + 36r = 34r 34r = -36r + 36r Combine like terms: -36r + 36r = 0 34r = 0 Divide each side by '34'. r = 0 Simplifying r = 0
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