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Simplifying 2a + -1 = a + 7 Reorder the terms: -1 + 2a = a + 7 Reorder the terms: -1 + 2a = 7 + a Solving -1 + 2a = 7 + a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1a' to each side of the equation. -1 + 2a + -1a = 7 + a + -1a Combine like terms: 2a + -1a = 1a -1 + 1a = 7 + a + -1a Combine like terms: a + -1a = 0 -1 + 1a = 7 + 0 -1 + 1a = 7 Add '1' to each side of the equation. -1 + 1 + 1a = 7 + 1 Combine like terms: -1 + 1 = 0 0 + 1a = 7 + 1 1a = 7 + 1 Combine like terms: 7 + 1 = 8 1a = 8 Divide each side by '1'. a = 8 Simplifying a = 8
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