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