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Simplifying (3)(4a + a) + -12 = 0 Combine like terms: 4a + a = 5a 3(5a) + -12 = 0 Remove parenthesis around (5a) 3 * 5a + -12 = 0 Multiply 3 * 5 15a + -12 = 0 Reorder the terms: -12 + 15a = 0 Solving -12 + 15a = 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 + 15a = 0 + 12 Combine like terms: -12 + 12 = 0 0 + 15a = 0 + 12 15a = 0 + 12 Combine like terms: 0 + 12 = 12 15a = 12 Divide each side by '15'. a = 0.8 Simplifying a = 0.8
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