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