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Simplifying 315 = a * 21 + b Reorder the terms for easier multiplication: 315 = 21a + b Solving 315 = 21a + b Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-21a' to each side of the equation. 315 + -21a = 21a + -21a + b Combine like terms: 21a + -21a = 0 315 + -21a = 0 + b 315 + -21a = b Add '-315' to each side of the equation. 315 + -315 + -21a = -315 + b Combine like terms: 315 + -315 = 0 0 + -21a = -315 + b -21a = -315 + b Divide each side by '-21'. a = 15 + -0.04761904762b Simplifying a = 15 + -0.04761904762b
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