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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 = -21 -21x = -21 Divide each side by '-21'. x = 1 Simplifying x = 1
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