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Simplifying 17a + 20 = 12a + 15 Reorder the terms: 20 + 17a = 12a + 15 Reorder the terms: 20 + 17a = 15 + 12a Solving 20 + 17a = 15 + 12a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-12a' to each side of the equation. 20 + 17a + -12a = 15 + 12a + -12a Combine like terms: 17a + -12a = 5a 20 + 5a = 15 + 12a + -12a Combine like terms: 12a + -12a = 0 20 + 5a = 15 + 0 20 + 5a = 15 Add '-20' to each side of the equation. 20 + -20 + 5a = 15 + -20 Combine like terms: 20 + -20 = 0 0 + 5a = 15 + -20 5a = 15 + -20 Combine like terms: 15 + -20 = -5 5a = -5 Divide each side by '5'. a = -1 Simplifying a = -1
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