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Simplifying 126 = -9(4 + r) 126 = (4 * -9 + r * -9) 126 = (-36 + -9r) Solving 126 = -36 + -9r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '9r' to each side of the equation. 126 + 9r = -36 + -9r + 9r Combine like terms: -9r + 9r = 0 126 + 9r = -36 + 0 126 + 9r = -36 Add '-126' to each side of the equation. 126 + -126 + 9r = -36 + -126 Combine like terms: 126 + -126 = 0 0 + 9r = -36 + -126 9r = -36 + -126 Combine like terms: -36 + -126 = -162 9r = -162 Divide each side by '9'. r = -18 Simplifying r = -18
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