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Simplifying 21a + 42b = 0 Solving 21a + 42b = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-42b' to each side of the equation. 21a + 42b + -42b = 0 + -42b Combine like terms: 42b + -42b = 0 21a + 0 = 0 + -42b 21a = 0 + -42b Remove the zero: 21a = -42b Divide each side by '21'. a = -2b Simplifying a = -2b
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