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Simplifying -7a + 9 = 3a + 4a Reorder the terms: 9 + -7a = 3a + 4a Combine like terms: 3a + 4a = 7a 9 + -7a = 7a Solving 9 + -7a = 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. 9 + -7a + -7a = 7a + -7a Combine like terms: -7a + -7a = -14a 9 + -14a = 7a + -7a Combine like terms: 7a + -7a = 0 9 + -14a = 0 Add '-9' to each side of the equation. 9 + -9 + -14a = 0 + -9 Combine like terms: 9 + -9 = 0 0 + -14a = 0 + -9 -14a = 0 + -9 Combine like terms: 0 + -9 = -9 -14a = -9 Divide each side by '-14'. a = 0.6428571429 Simplifying a = 0.6428571429
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