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Simplifying 7(3x + -9) = 105 Reorder the terms: 7(-9 + 3x) = 105 (-9 * 7 + 3x * 7) = 105 (-63 + 21x) = 105 Solving -63 + 21x = 105 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '63' to each side of the equation. -63 + 63 + 21x = 105 + 63 Combine like terms: -63 + 63 = 0 0 + 21x = 105 + 63 21x = 105 + 63 Combine like terms: 105 + 63 = 168 21x = 168 Divide each side by '21'. x = 8 Simplifying x = 8
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