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Simplifying 2(a + -7) + -7 = 9 Reorder the terms: 2(-7 + a) + -7 = 9 (-7 * 2 + a * 2) + -7 = 9 (-14 + 2a) + -7 = 9 Reorder the terms: -14 + -7 + 2a = 9 Combine like terms: -14 + -7 = -21 -21 + 2a = 9 Solving -21 + 2a = 9 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 2a = 9 + 21 Combine like terms: -21 + 21 = 0 0 + 2a = 9 + 21 2a = 9 + 21 Combine like terms: 9 + 21 = 30 2a = 30 Divide each side by '2'. a = 15 Simplifying a = 15
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