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Simplifying a * 21 = 7a + 3 * 21 Reorder the terms for easier multiplication: 21a = 7a + 3 * 21 Multiply 3 * 21 21a = 7a + 63 Reorder the terms: 21a = 63 + 7a Solving 21a = 63 + 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. 21a + -7a = 63 + 7a + -7a Combine like terms: 21a + -7a = 14a 14a = 63 + 7a + -7a Combine like terms: 7a + -7a = 0 14a = 63 + 0 14a = 63 Divide each side by '14'. a = 4.5 Simplifying a = 4.5
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