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Simplifying 3a * 21 = 7 + -4a Reorder the terms for easier multiplication: 3 * 21a = 7 + -4a Multiply 3 * 21 63a = 7 + -4a Solving 63a = 7 + -4a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '4a' to each side of the equation. 63a + 4a = 7 + -4a + 4a Combine like terms: 63a + 4a = 67a 67a = 7 + -4a + 4a Combine like terms: -4a + 4a = 0 67a = 7 + 0 67a = 7 Divide each side by '67'. a = 0.1044776119 Simplifying a = 0.1044776119
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