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