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Simplifying 2a + -4(-1a) = 0 Remove parenthesis around (-1a) 2a + -4 * -1a = 0 Multiply -4 * -1 2a + 4a = 0 Combine like terms: 2a + 4a = 6a 6a = 0 Solving 6a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Divide each side by '6'. a = 0 Simplifying a = 0
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