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Simplifying (2a2 + -7a) + -1(2a2 + -4a) = 0 Reorder the terms: (-7a + 2a2) + -1(2a2 + -4a) = 0 Remove parenthesis around (-7a + 2a2) -7a + 2a2 + -1(2a2 + -4a) = 0 Reorder the terms: -7a + 2a2 + -1(-4a + 2a2) = 0 -7a + 2a2 + (-4a * -1 + 2a2 * -1) = 0 -7a + 2a2 + (4a + -2a2) = 0 Reorder the terms: -7a + 4a + 2a2 + -2a2 = 0 Combine like terms: -7a + 4a = -3a -3a + 2a2 + -2a2 = 0 Combine like terms: 2a2 + -2a2 = 0 -3a + 0 = 0 -3a = 0 Solving -3a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Divide each side by '-3'. a = 0 Simplifying a = 0
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