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Simplifying -3(2x + 7) = 21 Reorder the terms: -3(7 + 2x) = 21 (7 * -3 + 2x * -3) = 21 (-21 + -6x) = 21 Solving -21 + -6x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + -6x = 21 + 21 Combine like terms: -21 + 21 = 0 0 + -6x = 21 + 21 -6x = 21 + 21 Combine like terms: 21 + 21 = 42 -6x = 42 Divide each side by '-6'. x = -7 Simplifying x = -7
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