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Simplifying 9a + -18b + 21c = 0 Solving 9a + -18b + 21c = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '18b' to each side of the equation. 9a + -18b + 18b + 21c = 0 + 18b Combine like terms: -18b + 18b = 0 9a + 0 + 21c = 0 + 18b 9a + 21c = 0 + 18b Remove the zero: 9a + 21c = 18b Add '-21c' to each side of the equation. 9a + 21c + -21c = 18b + -21c Combine like terms: 21c + -21c = 0 9a + 0 = 18b + -21c 9a = 18b + -21c Divide each side by '9'. a = 2b + -2.333333333c Simplifying a = 2b + -2.333333333c
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