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Simplifying 21x + 1 = 13x + -3 Reorder the terms: 1 + 21x = 13x + -3 Reorder the terms: 1 + 21x = -3 + 13x Solving 1 + 21x = -3 + 13x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-13x' to each side of the equation. 1 + 21x + -13x = -3 + 13x + -13x Combine like terms: 21x + -13x = 8x 1 + 8x = -3 + 13x + -13x Combine like terms: 13x + -13x = 0 1 + 8x = -3 + 0 1 + 8x = -3 Add '-1' to each side of the equation. 1 + -1 + 8x = -3 + -1 Combine like terms: 1 + -1 = 0 0 + 8x = -3 + -1 8x = -3 + -1 Combine like terms: -3 + -1 = -4 8x = -4 Divide each side by '8'. x = -0.5 Simplifying x = -0.5
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