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Simplifying 19a + -1(-6a) + -1(-5a) + -15a + 2 = -13 Remove parenthesis around (-6a) 19a + -1 * -6a + -1(-5a) + -15a + 2 = -13 Multiply -1 * -6 19a + 6a + -1(-5a) + -15a + 2 = -13 Remove parenthesis around (-5a) 19a + 6a + -1 * -5a + -15a + 2 = -13 Multiply -1 * -5 19a + 6a + 5a + -15a + 2 = -13 Reorder the terms: 2 + 19a + 6a + 5a + -15a = -13 Combine like terms: 19a + 6a = 25a 2 + 25a + 5a + -15a = -13 Combine like terms: 25a + 5a = 30a 2 + 30a + -15a = -13 Combine like terms: 30a + -15a = 15a 2 + 15a = -13 Solving 2 + 15a = -13 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + 15a = -13 + -2 Combine like terms: 2 + -2 = 0 0 + 15a = -13 + -2 15a = -13 + -2 Combine like terms: -13 + -2 = -15 15a = -15 Divide each side by '15'. a = -1 Simplifying a = -1
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