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Simplifying -3(x + -7) = -42 Reorder the terms: -3(-7 + x) = -42 (-7 * -3 + x * -3) = -42 (21 + -3x) = -42 Solving 21 + -3x = -42 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + -3x = -42 + -21 Combine like terms: 21 + -21 = 0 0 + -3x = -42 + -21 -3x = -42 + -21 Combine like terms: -42 + -21 = -63 -3x = -63 Divide each side by '-3'. x = 21 Simplifying x = 21
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