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Simplifying 3x + 15 = 21 + 7y Reorder the terms: 15 + 3x = 21 + 7y Solving 15 + 3x = 21 + 7y Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + 3x = 21 + -15 + 7y Combine like terms: 15 + -15 = 0 0 + 3x = 21 + -15 + 7y 3x = 21 + -15 + 7y Combine like terms: 21 + -15 = 6 3x = 6 + 7y Divide each side by '3'. x = 2 + 2.333333333y Simplifying x = 2 + 2.333333333y
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