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Simplifying 9 + -4(-1a + 9) + 3(7 + -2a) = 0 Reorder the terms: 9 + -4(9 + -1a) + 3(7 + -2a) = 0 9 + (9 * -4 + -1a * -4) + 3(7 + -2a) = 0 9 + (-36 + 4a) + 3(7 + -2a) = 0 9 + -36 + 4a + (7 * 3 + -2a * 3) = 0 9 + -36 + 4a + (21 + -6a) = 0 Reorder the terms: 9 + -36 + 21 + 4a + -6a = 0 Combine like terms: 9 + -36 = -27 -27 + 21 + 4a + -6a = 0 Combine like terms: -27 + 21 = -6 -6 + 4a + -6a = 0 Combine like terms: 4a + -6a = -2a -6 + -2a = 0 Solving -6 + -2a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + -2a = 0 + 6 Combine like terms: -6 + 6 = 0 0 + -2a = 0 + 6 -2a = 0 + 6 Combine like terms: 0 + 6 = 6 -2a = 6 Divide each side by '-2'. a = -3 Simplifying a = -3
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