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Simplifying 3a + 21b + 15c = 0 Solving 3a + 21b + 15c = 0 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. 3a + 21b + -21b + 15c = 0 + -21b Combine like terms: 21b + -21b = 0 3a + 0 + 15c = 0 + -21b 3a + 15c = 0 + -21b Remove the zero: 3a + 15c = -21b Add '-15c' to each side of the equation. 3a + 15c + -15c = -21b + -15c Combine like terms: 15c + -15c = 0 3a + 0 = -21b + -15c 3a = -21b + -15c Divide each side by '3'. a = -7b + -5c Simplifying a = -7b + -5c
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