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Simplifying 7 + -1a + c = 15 Solving 7 + -1a + c = 15 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 + -1a + -7 + c = 15 + -7 Reorder the terms: 7 + -7 + -1a + c = 15 + -7 Combine like terms: 7 + -7 = 0 0 + -1a + c = 15 + -7 -1a + c = 15 + -7 Combine like terms: 15 + -7 = 8 -1a + c = 8 Add '-1c' to each side of the equation. -1a + c + -1c = 8 + -1c Combine like terms: c + -1c = 0 -1a + 0 = 8 + -1c -1a = 8 + -1c Divide each side by '-1'. a = -8 + c Simplifying a = -8 + c
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