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Simplifying -19a + -1(-9a) + -1(-20a) + (-16a) = 15 Remove parenthesis around (-9a) -19a + -1 * -9a + -1(-20a) + (-16a) = 15 Multiply -1 * -9 -19a + 9a + -1(-20a) + (-16a) = 15 Remove parenthesis around (-20a) -19a + 9a + -1 * -20a + (-16a) = 15 Multiply -1 * -20 -19a + 9a + 20a + (-16a) = 15 Combine like terms: -19a + 9a = -10a -10a + 20a + (-16a) = 15 Combine like terms: -10a + 20a = 10a 10a + (-16a) = 15 Combine like terms: 10a + (-16a) = -6a -6a = 15 Solving -6a = 15 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Divide each side by '-6'. a = -2.5 Simplifying a = -2.5
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