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Simplifying (2x + 9) + -1(4x + -9) = 0 Reorder the terms: (9 + 2x) + -1(4x + -9) = 0 Remove parenthesis around (9 + 2x) 9 + 2x + -1(4x + -9) = 0 Reorder the terms: 9 + 2x + -1(-9 + 4x) = 0 9 + 2x + (-9 * -1 + 4x * -1) = 0 9 + 2x + (9 + -4x) = 0 Reorder the terms: 9 + 9 + 2x + -4x = 0 Combine like terms: 9 + 9 = 18 18 + 2x + -4x = 0 Combine like terms: 2x + -4x = -2x 18 + -2x = 0 Solving 18 + -2x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-18' to each side of the equation. 18 + -18 + -2x = 0 + -18 Combine like terms: 18 + -18 = 0 0 + -2x = 0 + -18 -2x = 0 + -18 Combine like terms: 0 + -18 = -18 -2x = -18 Divide each side by '-2'. x = 9 Simplifying x = 9
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