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Simplifying -4a + 20 + 2a = 8a + -5a Reorder the terms: 20 + -4a + 2a = 8a + -5a Combine like terms: -4a + 2a = -2a 20 + -2a = 8a + -5a Combine like terms: 8a + -5a = 3a 20 + -2a = 3a Solving 20 + -2a = 3a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-3a' to each side of the equation. 20 + -2a + -3a = 3a + -3a Combine like terms: -2a + -3a = -5a 20 + -5a = 3a + -3a Combine like terms: 3a + -3a = 0 20 + -5a = 0 Add '-20' to each side of the equation. 20 + -20 + -5a = 0 + -20 Combine like terms: 20 + -20 = 0 0 + -5a = 0 + -20 -5a = 0 + -20 Combine like terms: 0 + -20 = -20 -5a = -20 Divide each side by '-5'. a = 4 Simplifying a = 4
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