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Simplifying 15 + -2(4 + 7a) + 5a = 0 15 + (4 * -2 + 7a * -2) + 5a = 0 15 + (-8 + -14a) + 5a = 0 Combine like terms: 15 + -8 = 7 7 + -14a + 5a = 0 Combine like terms: -14a + 5a = -9a 7 + -9a = 0 Solving 7 + -9a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -9a = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -9a = 0 + -7 -9a = 0 + -7 Combine like terms: 0 + -7 = -7 -9a = -7 Divide each side by '-9'. a = 0.7777777778 Simplifying a = 0.7777777778
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