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Simplifying 42 = 3(7 + -1X) 42 = (7 * 3 + -1X * 3) 42 = (21 + -3X) Solving 42 = 21 + -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. 42 + 3X = 21 + -3X + 3X Combine like terms: -3X + 3X = 0 42 + 3X = 21 + 0 42 + 3X = 21 Add '-42' to each side of the equation. 42 + -42 + 3X = 21 + -42 Combine like terms: 42 + -42 = 0 0 + 3X = 21 + -42 3X = 21 + -42 Combine like terms: 21 + -42 = -21 3X = -21 Divide each side by '3'. X = -7 Simplifying X = -7
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