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Simplifying 129 + -6x = 21x + 15 Reorder the terms: 129 + -6x = 15 + 21x Solving 129 + -6x = 15 + 21x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21x' to each side of the equation. 129 + -6x + -21x = 15 + 21x + -21x Combine like terms: -6x + -21x = -27x 129 + -27x = 15 + 21x + -21x Combine like terms: 21x + -21x = 0 129 + -27x = 15 + 0 129 + -27x = 15 Add '-129' to each side of the equation. 129 + -129 + -27x = 15 + -129 Combine like terms: 129 + -129 = 0 0 + -27x = 15 + -129 -27x = 15 + -129 Combine like terms: 15 + -129 = -114 -27x = -114 Divide each side by '-27'. x = 4.222222222 Simplifying x = 4.222222222
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