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