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Simplifying 16 + 7c + 5 + -7a + c = 0 Reorder the terms: 16 + 5 + -7a + 7c + c = 0 Combine like terms: 16 + 5 = 21 21 + -7a + 7c + c = 0 Combine like terms: 7c + c = 8c 21 + -7a + 8c = 0 Solving 21 + -7a + 8c = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -7a + -21 + 8c = 0 + -21 Reorder the terms: 21 + -21 + -7a + 8c = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -7a + 8c = 0 + -21 -7a + 8c = 0 + -21 Combine like terms: 0 + -21 = -21 -7a + 8c = -21 Add '-8c' to each side of the equation. -7a + 8c + -8c = -21 + -8c Combine like terms: 8c + -8c = 0 -7a + 0 = -21 + -8c -7a = -21 + -8c Divide each side by '-7'. a = 3 + 1.142857143c Simplifying a = 3 + 1.142857143c
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