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Simplifying 2a + 5 + -9(a + -7) = 48 Reorder the terms: 2a + 5 + -9(-7 + a) = 48 2a + 5 + (-7 * -9 + a * -9) = 48 2a + 5 + (63 + -9a) = 48 Reorder the terms: 5 + 63 + 2a + -9a = 48 Combine like terms: 5 + 63 = 68 68 + 2a + -9a = 48 Combine like terms: 2a + -9a = -7a 68 + -7a = 48 Solving 68 + -7a = 48 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-68' to each side of the equation. 68 + -68 + -7a = 48 + -68 Combine like terms: 68 + -68 = 0 0 + -7a = 48 + -68 -7a = 48 + -68 Combine like terms: 48 + -68 = -20 -7a = -20 Divide each side by '-7'. a = 2.857142857 Simplifying a = 2.857142857
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