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Simplifying (21 + -1)(4a + a) + -12 = 0 Combine like terms: 21 + -1 = 20 (20)(4a + a) + -12 = 0 Combine like terms: 4a + a = 5a 20(5a) + -12 = 0 Remove parenthesis around (5a) 20 * 5a + -12 = 0 Multiply 20 * 5 100a + -12 = 0 Reorder the terms: -12 + 100a = 0 Solving -12 + 100a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + 100a = 0 + 12 Combine like terms: -12 + 12 = 0 0 + 100a = 0 + 12 100a = 0 + 12 Combine like terms: 0 + 12 = 12 100a = 12 Divide each side by '100'. a = 0.12 Simplifying a = 0.12
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