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Simplifying 20 + -6a = 6 + 14 + -21a Combine like terms: 6 + 14 = 20 20 + -6a = 20 + -21a Add '-20' to each side of the equation. 20 + -20 + -6a = 20 + -20 + -21a Combine like terms: 20 + -20 = 0 0 + -6a = 20 + -20 + -21a -6a = 20 + -20 + -21a Combine like terms: 20 + -20 = 0 -6a = 0 + -21a -6a = -21a Solving -6a = -21a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '21a' to each side of the equation. -6a + 21a = -21a + 21a Combine like terms: -6a + 21a = 15a 15a = -21a + 21a Combine like terms: -21a + 21a = 0 15a = 0 Divide each side by '15'. a = 0 Simplifying a = 0
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