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Simplifying 21(x + -15) = 78 Reorder the terms: 21(-15 + x) = 78 (-15 * 21 + x * 21) = 78 (-315 + 21x) = 78 Solving -315 + 21x = 78 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '315' to each side of the equation. -315 + 315 + 21x = 78 + 315 Combine like terms: -315 + 315 = 0 0 + 21x = 78 + 315 21x = 78 + 315 Combine like terms: 78 + 315 = 393 21x = 393 Divide each side by '21'. x = 18.71428571 Simplifying x = 18.71428571
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