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Simplifying 9x + -3(2x + -4) = 21 Reorder the terms: 9x + -3(-4 + 2x) = 21 9x + (-4 * -3 + 2x * -3) = 21 9x + (12 + -6x) = 21 Reorder the terms: 12 + 9x + -6x = 21 Combine like terms: 9x + -6x = 3x 12 + 3x = 21 Solving 12 + 3x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + 3x = 21 + -12 Combine like terms: 12 + -12 = 0 0 + 3x = 21 + -12 3x = 21 + -12 Combine like terms: 21 + -12 = 9 3x = 9 Divide each side by '3'. x = 3 Simplifying x = 3
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