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Simplifying 21 = 2(2x + -1) + 3 Reorder the terms: 21 = 2(-1 + 2x) + 3 21 = (-1 * 2 + 2x * 2) + 3 21 = (-2 + 4x) + 3 Reorder the terms: 21 = -2 + 3 + 4x Combine like terms: -2 + 3 = 1 21 = 1 + 4x Solving 21 = 1 + 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 = 1 + 4x + -4x Combine like terms: 4x + -4x = 0 21 + -4x = 1 + 0 21 + -4x = 1 Add '-21' to each side of the equation. 21 + -21 + -4x = 1 + -21 Combine like terms: 21 + -21 = 0 0 + -4x = 1 + -21 -4x = 1 + -21 Combine like terms: 1 + -21 = -20 -4x = -20 Divide each side by '-4'. x = 5 Simplifying x = 5
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