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Simplifying 21a + 18 = 0 Reorder the terms: 18 + 21a = 0 Solving 18 + 21a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-18' to each side of the equation. 18 + -18 + 21a = 0 + -18 Combine like terms: 18 + -18 = 0 0 + 21a = 0 + -18 21a = 0 + -18 Combine like terms: 0 + -18 = -18 21a = -18 Divide each side by '21'. a = -0.8571428571 Simplifying a = -0.8571428571
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