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Simplifying 3[5 + -1x] = 21 [5 * 3 + -1x * 3] = 21 [15 + -3x] = 21 Solving 15 + -3x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + -3x = 21 + -15 Combine like terms: 15 + -15 = 0 0 + -3x = 21 + -15 -3x = 21 + -15 Combine like terms: 21 + -15 = 6 -3x = 6 Divide each side by '-3'. x = -2 Simplifying x = -2
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