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Simplifying a(-2) + 4 = 20 Reorder the terms for easier multiplication: -2a + 4 = 20 Reorder the terms: 4 + -2a = 20 Solving 4 + -2a = 20 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 + -2a = 20 + -4 Combine like terms: 4 + -4 = 0 0 + -2a = 20 + -4 -2a = 20 + -4 Combine like terms: 20 + -4 = 16 -2a = 16 Divide each side by '-2'. a = -8 Simplifying a = -8
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