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Simplifying 21x + -13 = 12 + 13x Reorder the terms: -13 + 21x = 12 + 13x Solving -13 + 21x = 12 + 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. -13 + 21x + -13x = 12 + 13x + -13x Combine like terms: 21x + -13x = 8x -13 + 8x = 12 + 13x + -13x Combine like terms: 13x + -13x = 0 -13 + 8x = 12 + 0 -13 + 8x = 12 Add '13' to each side of the equation. -13 + 13 + 8x = 12 + 13 Combine like terms: -13 + 13 = 0 0 + 8x = 12 + 13 8x = 12 + 13 Combine like terms: 12 + 13 = 25 8x = 25 Divide each side by '8'. x = 3.125 Simplifying x = 3.125
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