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Simplifying 20 + -1a = 5a + -4 Reorder the terms: 20 + -1a = -4 + 5a Solving 20 + -1a = -4 + 5a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-5a' to each side of the equation. 20 + -1a + -5a = -4 + 5a + -5a Combine like terms: -1a + -5a = -6a 20 + -6a = -4 + 5a + -5a Combine like terms: 5a + -5a = 0 20 + -6a = -4 + 0 20 + -6a = -4 Add '-20' to each side of the equation. 20 + -20 + -6a = -4 + -20 Combine like terms: 20 + -20 = 0 0 + -6a = -4 + -20 -6a = -4 + -20 Combine like terms: -4 + -20 = -24 -6a = -24 Divide each side by '-6'. a = 4 Simplifying a = 4
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