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Simplifying 21 = 3(5 + -1x) 21 = (5 * 3 + -1x * 3) 21 = (15 + -3x) Solving 21 = 15 + -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. 21 + 3x = 15 + -3x + 3x Combine like terms: -3x + 3x = 0 21 + 3x = 15 + 0 21 + 3x = 15 Add '-21' to each side of the equation. 21 + -21 + 3x = 15 + -21 Combine like terms: 21 + -21 = 0 0 + 3x = 15 + -21 3x = 15 + -21 Combine like terms: 15 + -21 = -6 3x = -6 Divide each side by '3'. x = -2 Simplifying x = -2
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