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Simplifying 5a + 3b + 9c = 13 Solving 5a + 3b + 9c = 13 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-3b' to each side of the equation. 5a + 3b + -3b + 9c = 13 + -3b Combine like terms: 3b + -3b = 0 5a + 0 + 9c = 13 + -3b 5a + 9c = 13 + -3b Add '-9c' to each side of the equation. 5a + 9c + -9c = 13 + -3b + -9c Combine like terms: 9c + -9c = 0 5a + 0 = 13 + -3b + -9c 5a = 13 + -3b + -9c Divide each side by '5'. a = 2.6 + -0.6b + -1.8c Simplifying a = 2.6 + -0.6b + -1.8c
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