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Simplifying 6 + -3(3x + -3) = -21 Reorder the terms: 6 + -3(-3 + 3x) = -21 6 + (-3 * -3 + 3x * -3) = -21 6 + (9 + -9x) = -21 Combine like terms: 6 + 9 = 15 15 + -9x = -21 Solving 15 + -9x = -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 + -9x = -21 + -15 Combine like terms: 15 + -15 = 0 0 + -9x = -21 + -15 -9x = -21 + -15 Combine like terms: -21 + -15 = -36 -9x = -36 Divide each side by '-9'. x = 4 Simplifying x = 4
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