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Simplifying 5a + 2(a + -3) = 15 Reorder the terms: 5a + 2(-3 + a) = 15 5a + (-3 * 2 + a * 2) = 15 5a + (-6 + 2a) = 15 Reorder the terms: -6 + 5a + 2a = 15 Combine like terms: 5a + 2a = 7a -6 + 7a = 15 Solving -6 + 7a = 15 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 + 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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