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Simplifying 8a + -9 = 19 + a Reorder the terms: -9 + 8a = 19 + a Solving -9 + 8a = 19 + 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. -9 + 8a + -1a = 19 + a + -1a Combine like terms: 8a + -1a = 7a -9 + 7a = 19 + a + -1a Combine like terms: a + -1a = 0 -9 + 7a = 19 + 0 -9 + 7a = 19 Add '9' to each side of the equation. -9 + 9 + 7a = 19 + 9 Combine like terms: -9 + 9 = 0 0 + 7a = 19 + 9 7a = 19 + 9 Combine like terms: 19 + 9 = 28 7a = 28 Divide each side by '7'. a = 4 Simplifying a = 4
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