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Simplifying 3a + 7 + 2(3a) = 0 Remove parenthesis around (3a) 3a + 7 + 2 * 3a = 0 Multiply 2 * 3 3a + 7 + 6a = 0 Reorder the terms: 7 + 3a + 6a = 0 Combine like terms: 3a + 6a = 9a 7 + 9a = 0 Solving 7 + 9a = 0 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 + 9a = 0 + -7 Combine like terms: 7 + -7 = 0 0 + 9a = 0 + -7 9a = 0 + -7 Combine like terms: 0 + -7 = -7 9a = -7 Divide each side by '9'. a = -0.7777777778 Simplifying a = -0.7777777778
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