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Simplifying (3a + -2) + -4 = 20 Reorder the terms: (-2 + 3a) + -4 = 20 Remove parenthesis around (-2 + 3a) -2 + 3a + -4 = 20 Reorder the terms: -2 + -4 + 3a = 20 Combine like terms: -2 + -4 = -6 -6 + 3a = 20 Solving -6 + 3a = 20 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + 3a = 20 + 6 Combine like terms: -6 + 6 = 0 0 + 3a = 20 + 6 3a = 20 + 6 Combine like terms: 20 + 6 = 26 3a = 26 Divide each side by '3'. a = 8.666666667 Simplifying a = 8.666666667
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