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Simplifying 69a + 21b = 31.2 Solving 69a + 21b = 31.2 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-21b' to each side of the equation. 69a + 21b + -21b = 31.2 + -21b Combine like terms: 21b + -21b = 0 69a + 0 = 31.2 + -21b 69a = 31.2 + -21b Divide each side by '69'. a = 0.452173913 + -0.3043478261b Simplifying a = 0.452173913 + -0.3043478261b
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