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Simplifying 3 + 5(x + -9) = 3x Reorder the terms: 3 + 5(-9 + x) = 3x 3 + (-9 * 5 + x * 5) = 3x 3 + (-45 + 5x) = 3x Combine like terms: 3 + -45 = -42 -42 + 5x = 3x Solving -42 + 5x = 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. -42 + 5x + -3x = 3x + -3x Combine like terms: 5x + -3x = 2x -42 + 2x = 3x + -3x Combine like terms: 3x + -3x = 0 -42 + 2x = 0 Add '42' to each side of the equation. -42 + 42 + 2x = 0 + 42 Combine like terms: -42 + 42 = 0 0 + 2x = 0 + 42 2x = 0 + 42 Combine like terms: 0 + 42 = 42 2x = 42 Divide each side by '2'. x = 21 Simplifying x = 21
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