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Simplifying 2n2 + -1a + -21 = 0 Reorder the terms: -21 + -1a + 2n2 = 0 Solving -21 + -1a + 2n2 = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '21' to each side of the equation. -21 + -1a + 21 + 2n2 = 0 + 21 Reorder the terms: -21 + 21 + -1a + 2n2 = 0 + 21 Combine like terms: -21 + 21 = 0 0 + -1a + 2n2 = 0 + 21 -1a + 2n2 = 0 + 21 Combine like terms: 0 + 21 = 21 -1a + 2n2 = 21 Add '-2n2' to each side of the equation. -1a + 2n2 + -2n2 = 21 + -2n2 Combine like terms: 2n2 + -2n2 = 0 -1a + 0 = 21 + -2n2 -1a = 21 + -2n2 Divide each side by '-1'. a = -21 + 2n2 Simplifying a = -21 + 2n2
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