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Simplifying 20a * 2 + -13a + -21 = 0 Reorder the terms for easier multiplication: 20 * 2a + -13a + -21 = 0 Multiply 20 * 2 40a + -13a + -21 = 0 Reorder the terms: -21 + 40a + -13a = 0 Combine like terms: 40a + -13a = 27a -21 + 27a = 0 Solving -21 + 27a = 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 + 21 + 27a = 0 + 21 Combine like terms: -21 + 21 = 0 0 + 27a = 0 + 21 27a = 0 + 21 Combine like terms: 0 + 21 = 21 27a = 21 Divide each side by '27'. a = 0.7777777778 Simplifying a = 0.7777777778
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