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Simplifying 3(7 + -1x) = -3 (7 * 3 + -1x * 3) = -3 (21 + -3x) = -3 Solving 21 + -3x = -3 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 = -3 + -21 Combine like terms: 21 + -21 = 0 0 + -3x = -3 + -21 -3x = -3 + -21 Combine like terms: -3 + -21 = -24 -3x = -24 Divide each side by '-3'. x = 8 Simplifying x = 8
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