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Simplifying 20 = 4 + -2a Solving 20 = 4 + -2a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '2a' to each side of the equation. 20 + 2a = 4 + -2a + 2a Combine like terms: -2a + 2a = 0 20 + 2a = 4 + 0 20 + 2a = 4 Add '-20' to each side of the equation. 20 + -20 + 2a = 4 + -20 Combine like terms: 20 + -20 = 0 0 + 2a = 4 + -20 2a = 4 + -20 Combine like terms: 4 + -20 = -16 2a = -16 Divide each side by '2'. a = -8 Simplifying a = -8
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