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Simplifying 15x + 15 = 21x + -3 Reorder the terms: 15 + 15x = 21x + -3 Reorder the terms: 15 + 15x = -3 + 21x Solving 15 + 15x = -3 + 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. 15 + 15x + -21x = -3 + 21x + -21x Combine like terms: 15x + -21x = -6x 15 + -6x = -3 + 21x + -21x Combine like terms: 21x + -21x = 0 15 + -6x = -3 + 0 15 + -6x = -3 Add '-15' to each side of the equation. 15 + -15 + -6x = -3 + -15 Combine like terms: 15 + -15 = 0 0 + -6x = -3 + -15 -6x = -3 + -15 Combine like terms: -3 + -15 = -18 -6x = -18 Divide each side by '-6'. x = 3 Simplifying x = 3
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