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Simplifying 7(3x + -9) = 42 Reorder the terms: 7(-9 + 3x) = 42 (-9 * 7 + 3x * 7) = 42 (-63 + 21x) = 42 Solving -63 + 21x = 42 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 = 42 + 63 Combine like terms: -63 + 63 = 0 0 + 21x = 42 + 63 21x = 42 + 63 Combine like terms: 42 + 63 = 105 21x = 105 Divide each side by '21'. x = 5 Simplifying x = 5
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