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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 = -63 -3x = -63 Divide each side by '-3'. x = 21 Simplifying x = 21
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