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Simplifying 13 = a(15 + 0)(15 + -30) Combine like terms: 15 + 0 = 15 13 = a(15)(15 + -30) Combine like terms: 15 + -30 = -15 13 = a * 15(-15) Reorder the terms for easier multiplication: 13 = 15 * -15a Multiply 15 * -15 13 = -225a Solving 13 = -225a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '225a' to each side of the equation. 13 + 225a = -225a + 225a Combine like terms: -225a + 225a = 0 13 + 225a = 0 Add '-13' to each side of the equation. 13 + -13 + 225a = 0 + -13 Combine like terms: 13 + -13 = 0 0 + 225a = 0 + -13 225a = 0 + -13 Combine like terms: 0 + -13 = -13 225a = -13 Divide each side by '225'. a = -0.05777777778 Simplifying a = -0.05777777778
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