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Simplifying a + a + 64 = 90 Reorder the terms: 64 + a + a = 90 Combine like terms: a + a = 2a 64 + 2a = 90 Solving 64 + 2a = 90 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-64' to each side of the equation. 64 + -64 + 2a = 90 + -64 Combine like terms: 64 + -64 = 0 0 + 2a = 90 + -64 2a = 90 + -64 Combine like terms: 90 + -64 = 26 2a = 26 Divide each side by '2'. a = 13 Simplifying a = 13
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