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Simplifying 3a + -7 = 20 Reorder the terms: -7 + 3a = 20 Solving -7 + 3a = 20 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + 3a = 20 + 7 Combine like terms: -7 + 7 = 0 0 + 3a = 20 + 7 3a = 20 + 7 Combine like terms: 20 + 7 = 27 3a = 27 Divide each side by '3'. a = 9 Simplifying a = 9
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