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Simplifying 0 = -7(-1) + -7(9) * a Multiply -7 * -1 0 = 7 + -7(9) * a Multiply -7 * 9 0 = 7 + -63a Solving 0 = 7 + -63a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '63a' to each side of the equation. 0 + 63a = 7 + -63a + 63a Remove the zero: 63a = 7 + -63a + 63a Combine like terms: -63a + 63a = 0 63a = 7 + 0 63a = 7 Divide each side by '63'. a = 0.1111111111 Simplifying a = 0.1111111111
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