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Simplifying 2a + 6 = 9a + -15 Reorder the terms: 6 + 2a = 9a + -15 Reorder the terms: 6 + 2a = -15 + 9a Solving 6 + 2a = -15 + 9a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-9a' to each side of the equation. 6 + 2a + -9a = -15 + 9a + -9a Combine like terms: 2a + -9a = -7a 6 + -7a = -15 + 9a + -9a Combine like terms: 9a + -9a = 0 6 + -7a = -15 + 0 6 + -7a = -15 Add '-6' to each side of the equation. 6 + -6 + -7a = -15 + -6 Combine like terms: 6 + -6 = 0 0 + -7a = -15 + -6 -7a = -15 + -6 Combine like terms: -15 + -6 = -21 -7a = -21 Divide each side by '-7'. a = 3 Simplifying a = 3
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