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Simplifying 3 + 3(3x + -3) = 21 Reorder the terms: 3 + 3(-3 + 3x) = 21 3 + (-3 * 3 + 3x * 3) = 21 3 + (-9 + 9x) = 21 Combine like terms: 3 + -9 = -6 -6 + 9x = 21 Solving -6 + 9x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + 9x = 21 + 6 Combine like terms: -6 + 6 = 0 0 + 9x = 21 + 6 9x = 21 + 6 Combine like terms: 21 + 6 = 27 9x = 27 Divide each side by '9'. x = 3 Simplifying x = 3
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