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Simplifying 9x + -3(2x + -5) = 21 Reorder the terms: 9x + -3(-5 + 2x) = 21 9x + (-5 * -3 + 2x * -3) = 21 9x + (15 + -6x) = 21 Reorder the terms: 15 + 9x + -6x = 21 Combine like terms: 9x + -6x = 3x 15 + 3x = 21 Solving 15 + 3x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + 3x = 21 + -15 Combine like terms: 15 + -15 = 0 0 + 3x = 21 + -15 3x = 21 + -15 Combine like terms: 21 + -15 = 6 3x = 6 Divide each side by '3'. x = 2 Simplifying x = 2
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