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Simplifying -20 = 4a + 4 + 8a Reorder the terms: -20 = 4 + 4a + 8a Combine like terms: 4a + 8a = 12a -20 = 4 + 12a Solving -20 = 4 + 12a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-12a' to each side of the equation. -20 + -12a = 4 + 12a + -12a Combine like terms: 12a + -12a = 0 -20 + -12a = 4 + 0 -20 + -12a = 4 Add '20' to each side of the equation. -20 + 20 + -12a = 4 + 20 Combine like terms: -20 + 20 = 0 0 + -12a = 4 + 20 -12a = 4 + 20 Combine like terms: 4 + 20 = 24 -12a = 24 Divide each side by '-12'. a = -2 Simplifying a = -2
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