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Simplifying 2a + 2(a + -7) = 86 Reorder the terms: 2a + 2(-7 + a) = 86 2a + (-7 * 2 + a * 2) = 86 2a + (-14 + 2a) = 86 Reorder the terms: -14 + 2a + 2a = 86 Combine like terms: 2a + 2a = 4a -14 + 4a = 86 Solving -14 + 4a = 86 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '14' to each side of the equation. -14 + 14 + 4a = 86 + 14 Combine like terms: -14 + 14 = 0 0 + 4a = 86 + 14 4a = 86 + 14 Combine like terms: 86 + 14 = 100 4a = 100 Divide each side by '4'. a = 25 Simplifying a = 25
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