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Simplifying 2a + -7a + -9 = 0 Reorder the terms: -9 + 2a + -7a = 0 Combine like terms: 2a + -7a = -5a -9 + -5a = 0 Solving -9 + -5a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + -5a = 0 + 9 Combine like terms: -9 + 9 = 0 0 + -5a = 0 + 9 -5a = 0 + 9 Combine like terms: 0 + 9 = 9 -5a = 9 Divide each side by '-5'. a = -1.8 Simplifying a = -1.8
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