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Simplifying -13 + -4a = 3(3 + -5a) -13 + -4a = (3 * 3 + -5a * 3) -13 + -4a = (9 + -15a) Solving -13 + -4a = 9 + -15a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '15a' to each side of the equation. -13 + -4a + 15a = 9 + -15a + 15a Combine like terms: -4a + 15a = 11a -13 + 11a = 9 + -15a + 15a Combine like terms: -15a + 15a = 0 -13 + 11a = 9 + 0 -13 + 11a = 9 Add '13' to each side of the equation. -13 + 13 + 11a = 9 + 13 Combine like terms: -13 + 13 = 0 0 + 11a = 9 + 13 11a = 9 + 13 Combine like terms: 9 + 13 = 22 11a = 22 Divide each side by '11'. a = 2 Simplifying a = 2
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