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Simplifying -20 = 8 + -7a Solving -20 = 8 + -7a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '7a' to each side of the equation. -20 + 7a = 8 + -7a + 7a Combine like terms: -7a + 7a = 0 -20 + 7a = 8 + 0 -20 + 7a = 8 Add '20' to each side of the equation. -20 + 20 + 7a = 8 + 20 Combine like terms: -20 + 20 = 0 0 + 7a = 8 + 20 7a = 8 + 20 Combine like terms: 8 + 20 = 28 7a = 28 Divide each side by '7'. a = 4 Simplifying a = 4
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