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Simplifying -3x + -3(x + 5) = 21 Reorder the terms: -3x + -3(5 + x) = 21 -3x + (5 * -3 + x * -3) = 21 -3x + (-15 + -3x) = 21 Reorder the terms: -15 + -3x + -3x = 21 Combine like terms: -3x + -3x = -6x -15 + -6x = 21 Solving -15 + -6x = 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 + -6x = 21 + 15 Combine like terms: -15 + 15 = 0 0 + -6x = 21 + 15 -6x = 21 + 15 Combine like terms: 21 + 15 = 36 -6x = 36 Divide each side by '-6'. x = -6 Simplifying x = -6
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