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Simplifying 1 + 9x + -3(2x + -4) = 13 Reorder the terms: 1 + 9x + -3(-4 + 2x) = 13 1 + 9x + (-4 * -3 + 2x * -3) = 13 1 + 9x + (12 + -6x) = 13 Reorder the terms: 1 + 12 + 9x + -6x = 13 Combine like terms: 1 + 12 = 13 13 + 9x + -6x = 13 Combine like terms: 9x + -6x = 3x 13 + 3x = 13 Add '-13' to each side of the equation. 13 + -13 + 3x = 13 + -13 Combine like terms: 13 + -13 = 0 0 + 3x = 13 + -13 3x = 13 + -13 Combine like terms: 13 + -13 = 0 3x = 0 Solving 3x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Divide each side by '3'. x = 0 Simplifying x = 0
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