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Simplifying 20 + 4x + 1 = 13 + -4x * 2 Reorder the terms: 20 + 1 + 4x = 13 + -4x * 2 Combine like terms: 20 + 1 = 21 21 + 4x = 13 + -4x * 2 Reorder the terms for easier multiplication: 21 + 4x = 13 + -4 * 2x Multiply -4 * 2 21 + 4x = 13 + -8x Solving 21 + 4x = 13 + -8x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8x' to each side of the equation. 21 + 4x + 8x = 13 + -8x + 8x Combine like terms: 4x + 8x = 12x 21 + 12x = 13 + -8x + 8x Combine like terms: -8x + 8x = 0 21 + 12x = 13 + 0 21 + 12x = 13 Add '-21' to each side of the equation. 21 + -21 + 12x = 13 + -21 Combine like terms: 21 + -21 = 0 0 + 12x = 13 + -21 12x = 13 + -21 Combine like terms: 13 + -21 = -8 12x = -8 Divide each side by '12'. x = -0.6666666667 Simplifying x = -0.6666666667
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