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Simplifying 3b + -1(-2a) + 9 = 7 Remove parenthesis around (-2a) 3b + -1 * -2a + 9 = 7 Multiply -1 * -2 3b + 2a + 9 = 7 Reorder the terms: 9 + 2a + 3b = 7 Solving 9 + 2a + 3b = 7 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + 2a + -9 + 3b = 7 + -9 Reorder the terms: 9 + -9 + 2a + 3b = 7 + -9 Combine like terms: 9 + -9 = 0 0 + 2a + 3b = 7 + -9 2a + 3b = 7 + -9 Combine like terms: 7 + -9 = -2 2a + 3b = -2 Add '-3b' to each side of the equation. 2a + 3b + -3b = -2 + -3b Combine like terms: 3b + -3b = 0 2a + 0 = -2 + -3b 2a = -2 + -3b Divide each side by '2'. a = -1 + -1.5b Simplifying a = -1 + -1.5b
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