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Simplifying -1(7a + -9b + 8c) = 0 (7a * -1 + -9b * -1 + 8c * -1) = 0 (-7a + 9b + -8c) = 0 Solving -7a + 9b + -8c = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-9b' to each side of the equation. -7a + 9b + -9b + -8c = 0 + -9b Combine like terms: 9b + -9b = 0 -7a + 0 + -8c = 0 + -9b -7a + -8c = 0 + -9b Remove the zero: -7a + -8c = -9b Add '8c' to each side of the equation. -7a + -8c + 8c = -9b + 8c Combine like terms: -8c + 8c = 0 -7a + 0 = -9b + 8c -7a = -9b + 8c Divide each side by '-7'. a = 1.285714286b + -1.142857143c Simplifying a = 1.285714286b + -1.142857143c
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