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Simplifying 18a + 21a + -4 = 0 Reorder the terms: -4 + 18a + 21a = 0 Combine like terms: 18a + 21a = 39a -4 + 39a = 0 Solving -4 + 39a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + 39a = 0 + 4 Combine like terms: -4 + 4 = 0 0 + 39a = 0 + 4 39a = 0 + 4 Combine like terms: 0 + 4 = 4 39a = 4 Divide each side by '39'. a = 0.1025641026 Simplifying a = 0.1025641026
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