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Simplifying 21a + 21b = 0 Solving 21a + 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. 21a + 21b + -21b = 0 + -21b Combine like terms: 21b + -21b = 0 21a + 0 = 0 + -21b 21a = 0 + -21b Remove the zero: 21a = -21b Divide each side by '21'. a = -1b Simplifying a = -1b
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