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Simplifying 9a + 15 + -10a = 7 Reorder the terms: 15 + 9a + -10a = 7 Combine like terms: 9a + -10a = -1a 15 + -1a = 7 Solving 15 + -1a = 7 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + -1a = 7 + -15 Combine like terms: 15 + -15 = 0 0 + -1a = 7 + -15 -1a = 7 + -15 Combine like terms: 7 + -15 = -8 -1a = -8 Divide each side by '-1'. a = 8 Simplifying a = 8
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