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Simplifying -7r + -4(9 + -2r) = 0 -7r + (9 * -4 + -2r * -4) = 0 -7r + (-36 + 8r) = 0 Reorder the terms: -36 + -7r + 8r = 0 Combine like terms: -7r + 8r = 1r -36 + 1r = 0 Solving -36 + 1r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '36' to each side of the equation. -36 + 36 + 1r = 0 + 36 Combine like terms: -36 + 36 = 0 0 + 1r = 0 + 36 1r = 0 + 36 Combine like terms: 0 + 36 = 36 1r = 36 Divide each side by '1'. r = 36 Simplifying r = 36
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