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