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Simplifying 7a + -15 = 13 Reorder the terms: -15 + 7a = 13 Solving -15 + 7a = 13 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 = 13 + 15 Combine like terms: -15 + 15 = 0 0 + 7a = 13 + 15 7a = 13 + 15 Combine like terms: 13 + 15 = 28 7a = 28 Divide each side by '7'. a = 4 Simplifying a = 4
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