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Simplifying (r + 3) + -2(r + 9) = 0 Reorder the terms: (3 + r) + -2(r + 9) = 0 Remove parenthesis around (3 + r) 3 + r + -2(r + 9) = 0 Reorder the terms: 3 + r + -2(9 + r) = 0 3 + r + (9 * -2 + r * -2) = 0 3 + r + (-18 + -2r) = 0 Reorder the terms: 3 + -18 + r + -2r = 0 Combine like terms: 3 + -18 = -15 -15 + r + -2r = 0 Combine like terms: r + -2r = -1r -15 + -1r = 0 Solving -15 + -1r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + -1r = 0 + 15 Combine like terms: -15 + 15 = 0 0 + -1r = 0 + 15 -1r = 0 + 15 Combine like terms: 0 + 15 = 15 -1r = 15 Divide each side by '-1'. r = -15 Simplifying r = -15
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