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Simplifying 5 + -3(2x + -1) = 21 Reorder the terms: 5 + -3(-1 + 2x) = 21 5 + (-1 * -3 + 2x * -3) = 21 5 + (3 + -6x) = 21 Combine like terms: 5 + 3 = 8 8 + -6x = 21 Solving 8 + -6x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + -6x = 21 + -8 Combine like terms: 8 + -8 = 0 0 + -6x = 21 + -8 -6x = 21 + -8 Combine like terms: 21 + -8 = 13 -6x = 13 Divide each side by '-6'. x = -2.166666667 Simplifying x = -2.166666667
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