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Simplifying 3a + -21b = 0 Solving 3a + -21b = 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 = 0 + 21b Combine like terms: -21b + 21b = 0 3a + 0 = 0 + 21b 3a = 0 + 21b Remove the zero: 3a = 21b Divide each side by '3'. a = 7b Simplifying a = 7b
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