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Simplifying 10a + -7 + 9a = -13 Reorder the terms: -7 + 10a + 9a = -13 Combine like terms: 10a + 9a = 19a -7 + 19a = -13 Solving -7 + 19a = -13 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 + 19a = -13 + 7 Combine like terms: -7 + 7 = 0 0 + 19a = -13 + 7 19a = -13 + 7 Combine like terms: -13 + 7 = -6 19a = -6 Divide each side by '19'. a = -0.3157894737 Simplifying a = -0.3157894737
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