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Simplifying 7a + -15 = 69 Reorder the terms: -15 + 7a = 69 Solving -15 + 7a = 69 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 + 7a = 69 + 15 Combine like terms: -15 + 15 = 0 0 + 7a = 69 + 15 7a = 69 + 15 Combine like terms: 69 + 15 = 84 7a = 84 Divide each side by '7'. a = 12 Simplifying a = 12
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