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Simplifying a * 13 = 7a + 3 * 13 Reorder the terms for easier multiplication: 13a = 7a + 3 * 13 Multiply 3 * 13 13a = 7a + 39 Reorder the terms: 13a = 39 + 7a Solving 13a = 39 + 7a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-7a' to each side of the equation. 13a + -7a = 39 + 7a + -7a Combine like terms: 13a + -7a = 6a 6a = 39 + 7a + -7a Combine like terms: 7a + -7a = 0 6a = 39 + 0 6a = 39 Divide each side by '6'. a = 6.5 Simplifying a = 6.5
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