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Simplifying -3(4x + 7) = (-3x + -9) Reorder the terms: -3(7 + 4x) = (-3x + -9) (7 * -3 + 4x * -3) = (-3x + -9) (-21 + -12x) = (-3x + -9) Reorder the terms: -21 + -12x = (-9 + -3x) Remove parenthesis around (-9 + -3x) -21 + -12x = -9 + -3x Solving -21 + -12x = -9 + -3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3x' to each side of the equation. -21 + -12x + 3x = -9 + -3x + 3x Combine like terms: -12x + 3x = -9x -21 + -9x = -9 + -3x + 3x Combine like terms: -3x + 3x = 0 -21 + -9x = -9 + 0 -21 + -9x = -9 Add '21' to each side of the equation. -21 + 21 + -9x = -9 + 21 Combine like terms: -21 + 21 = 0 0 + -9x = -9 + 21 -9x = -9 + 21 Combine like terms: -9 + 21 = 12 -9x = 12 Divide each side by '-9'. x = -1.333333333 Simplifying x = -1.333333333
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