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Simplifying 21 = -2(3x + -5) + 2x + 3 Reorder the terms: 21 = -2(-5 + 3x) + 2x + 3 21 = (-5 * -2 + 3x * -2) + 2x + 3 21 = (10 + -6x) + 2x + 3 Reorder the terms: 21 = 10 + 3 + -6x + 2x Combine like terms: 10 + 3 = 13 21 = 13 + -6x + 2x Combine like terms: -6x + 2x = -4x 21 = 13 + -4x Solving 21 = 13 + -4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4x' to each side of the equation. 21 + 4x = 13 + -4x + 4x Combine like terms: -4x + 4x = 0 21 + 4x = 13 + 0 21 + 4x = 13 Add '-21' to each side of the equation. 21 + -21 + 4x = 13 + -21 Combine like terms: 21 + -21 = 0 0 + 4x = 13 + -21 4x = 13 + -21 Combine like terms: 13 + -21 = -8 4x = -8 Divide each side by '4'. x = -2 Simplifying x = -2
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