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Simplifying 2(a + -7) + 3 = 9 Reorder the terms: 2(-7 + a) + 3 = 9 (-7 * 2 + a * 2) + 3 = 9 (-14 + 2a) + 3 = 9 Reorder the terms: -14 + 3 + 2a = 9 Combine like terms: -14 + 3 = -11 -11 + 2a = 9 Solving -11 + 2a = 9 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '11' to each side of the equation. -11 + 11 + 2a = 9 + 11 Combine like terms: -11 + 11 = 0 0 + 2a = 9 + 11 2a = 9 + 11 Combine like terms: 9 + 11 = 20 2a = 20 Divide each side by '2'. a = 10 Simplifying a = 10
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