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Simplifying 8a + -7a + -1 = 18 Reorder the terms: -1 + 8a + -7a = 18 Combine like terms: 8a + -7a = 1a -1 + 1a = 18 Solving -1 + 1a = 18 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + 1a = 18 + 1 Combine like terms: -1 + 1 = 0 0 + 1a = 18 + 1 1a = 18 + 1 Combine like terms: 18 + 1 = 19 1a = 19 Divide each side by '1'. a = 19 Simplifying a = 19
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