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Simplifying 7(3 + -1x) = 21 (3 * 7 + -1x * 7) = 21 (21 + -7x) = 21 Add '-21' to each side of the equation. 21 + -21 + -7x = 21 + -21 Combine like terms: 21 + -21 = 0 0 + -7x = 21 + -21 -7x = 21 + -21 Combine like terms: 21 + -21 = 0 -7x = 0 Solving -7x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Divide each side by '-7'. x = 0 Simplifying x = 0
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