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Simplifying 16a + -15a + 4 = 20 Reorder the terms: 4 + 16a + -15a = 20 Combine like terms: 16a + -15a = 1a 4 + 1a = 20 Solving 4 + 1a = 20 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + 1a = 20 + -4 Combine like terms: 4 + -4 = 0 0 + 1a = 20 + -4 1a = 20 + -4 Combine like terms: 20 + -4 = 16 1a = 16 Divide each side by '1'. a = 16 Simplifying a = 16
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