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Simplifying 15 + 21x = 78 Solving 15 + 21x = 78 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 + 21x = 78 + -15 Combine like terms: 15 + -15 = 0 0 + 21x = 78 + -15 21x = 78 + -15 Combine like terms: 78 + -15 = 63 21x = 63 Divide each side by '21'. x = 3 Simplifying x = 3
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