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Simplifying 3x + -1(3 + 9x) = -21 3x + (3 * -1 + 9x * -1) = -21 3x + (-3 + -9x) = -21 Reorder the terms: -3 + 3x + -9x = -21 Combine like terms: 3x + -9x = -6x -3 + -6x = -21 Solving -3 + -6x = -21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + -6x = -21 + 3 Combine like terms: -3 + 3 = 0 0 + -6x = -21 + 3 -6x = -21 + 3 Combine like terms: -21 + 3 = -18 -6x = -18 Divide each side by '-6'. x = 3 Simplifying x = 3
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