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Simplifying 643 = 7a + 2b Solving 643 = 7a + 2b 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. 643 + -7a = 7a + -7a + 2b Combine like terms: 7a + -7a = 0 643 + -7a = 0 + 2b 643 + -7a = 2b Add '-643' to each side of the equation. 643 + -643 + -7a = -643 + 2b Combine like terms: 643 + -643 = 0 0 + -7a = -643 + 2b -7a = -643 + 2b Divide each side by '-7'. a = 91.85714286 + -0.2857142857b Simplifying a = 91.85714286 + -0.2857142857b
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