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Simplifying 21a + 28y = 0 Solving 21a + 28y = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-28y' to each side of the equation. 21a + 28y + -28y = 0 + -28y Combine like terms: 28y + -28y = 0 21a + 0 = 0 + -28y 21a = 0 + -28y Remove the zero: 21a = -28y Divide each side by '21'. a = -1.333333333y Simplifying a = -1.333333333y
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