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Simplifying 9a + 6b + 12c = 690 Solving 9a + 6b + 12c = 690 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-6b' to each side of the equation. 9a + 6b + -6b + 12c = 690 + -6b Combine like terms: 6b + -6b = 0 9a + 0 + 12c = 690 + -6b 9a + 12c = 690 + -6b Add '-12c' to each side of the equation. 9a + 12c + -12c = 690 + -6b + -12c Combine like terms: 12c + -12c = 0 9a + 0 = 690 + -6b + -12c 9a = 690 + -6b + -12c Divide each side by '9'. a = 76.66666667 + -0.6666666667b + -1.333333333c Simplifying a = 76.66666667 + -0.6666666667b + -1.333333333c
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