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Simplifying (15 + -2(x + 3)) = (x + 9) Reorder the terms: (15 + -2(3 + x)) = (x + 9) (15 + (3 * -2 + x * -2)) = (x + 9) (15 + (-6 + -2x)) = (x + 9) Combine like terms: 15 + -6 = 9 (9 + -2x) = (x + 9) Remove parenthesis around (9 + -2x) 9 + -2x = (x + 9) Reorder the terms: 9 + -2x = (9 + x) Remove parenthesis around (9 + x) 9 + -2x = 9 + x Add '-9' to each side of the equation. 9 + -9 + -2x = 9 + -9 + x Combine like terms: 9 + -9 = 0 0 + -2x = 9 + -9 + x -2x = 9 + -9 + x Combine like terms: 9 + -9 = 0 -2x = 0 + x -2x = x Solving -2x = x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. -2x + -1x = x + -1x Combine like terms: -2x + -1x = -3x -3x = x + -1x Combine like terms: x + -1x = 0 -3x = 0 Divide each side by '-3'. x = 0 Simplifying x = 0
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