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Simplifying -4a + 40 + 7a = 2a + -9a Reorder the terms: 40 + -4a + 7a = 2a + -9a Combine like terms: -4a + 7a = 3a 40 + 3a = 2a + -9a Combine like terms: 2a + -9a = -7a 40 + 3a = -7a Solving 40 + 3a = -7a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '7a' to each side of the equation. 40 + 3a + 7a = -7a + 7a Combine like terms: 3a + 7a = 10a 40 + 10a = -7a + 7a Combine like terms: -7a + 7a = 0 40 + 10a = 0 Add '-40' to each side of the equation. 40 + -40 + 10a = 0 + -40 Combine like terms: 40 + -40 = 0 0 + 10a = 0 + -40 10a = 0 + -40 Combine like terms: 0 + -40 = -40 10a = -40 Divide each side by '10'. a = -4 Simplifying a = -4
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