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Simplifying 19a + -1(-9a) + -1(-20a) + (-15a) = 15 Remove parenthesis around (-9a) 19a + -1 * -9a + -1(-20a) + (-15a) = 15 Multiply -1 * -9 19a + 9a + -1(-20a) + (-15a) = 15 Remove parenthesis around (-20a) 19a + 9a + -1 * -20a + (-15a) = 15 Multiply -1 * -20 19a + 9a + 20a + (-15a) = 15 Combine like terms: 19a + 9a = 28a 28a + 20a + (-15a) = 15 Combine like terms: 28a + 20a = 48a 48a + (-15a) = 15 Combine like terms: 48a + (-15a) = 33a 33a = 15 Solving 33a = 15 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Divide each side by '33'. a = 0.4545454545 Simplifying a = 0.4545454545
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