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Simplifying 7 + 2(a + -7) = 0 Reorder the terms: 7 + 2(-7 + a) = 0 7 + (-7 * 2 + a * 2) = 0 7 + (-14 + 2a) = 0 Combine like terms: 7 + -14 = -7 -7 + 2a = 0 Solving -7 + 2a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + 2a = 0 + 7 Combine like terms: -7 + 7 = 0 0 + 2a = 0 + 7 2a = 0 + 7 Combine like terms: 0 + 7 = 7 2a = 7 Divide each side by '2'. a = 3.5 Simplifying a = 3.5
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