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Simplifying 200(a + 12) = 644 Reorder the terms: 200(12 + a) = 644 (12 * 200 + a * 200) = 644 (2400 + 200a) = 644 Solving 2400 + 200a = 644 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-2400' to each side of the equation. 2400 + -2400 + 200a = 644 + -2400 Combine like terms: 2400 + -2400 = 0 0 + 200a = 644 + -2400 200a = 644 + -2400 Combine like terms: 644 + -2400 = -1756 200a = -1756 Divide each side by '200'. a = -8.78 Simplifying a = -8.78
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