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Simplifying -3(x + 7) = -9x + -9 Reorder the terms: -3(7 + x) = -9x + -9 (7 * -3 + x * -3) = -9x + -9 (-21 + -3x) = -9x + -9 Reorder the terms: -21 + -3x = -9 + -9x Solving -21 + -3x = -9 + -9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9x' to each side of the equation. -21 + -3x + 9x = -9 + -9x + 9x Combine like terms: -3x + 9x = 6x -21 + 6x = -9 + -9x + 9x Combine like terms: -9x + 9x = 0 -21 + 6x = -9 + 0 -21 + 6x = -9 Add '21' to each side of the equation. -21 + 21 + 6x = -9 + 21 Combine like terms: -21 + 21 = 0 0 + 6x = -9 + 21 6x = -9 + 21 Combine like terms: -9 + 21 = 12 6x = 12 Divide each side by '6'. x = 2 Simplifying x = 2
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