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Simplifying 5a + b = 21 Solving 5a + b = 21 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1b' to each side of the equation. 5a + b + -1b = 21 + -1b Combine like terms: b + -1b = 0 5a + 0 = 21 + -1b 5a = 21 + -1b Divide each side by '5'. a = 4.2 + -0.2b Simplifying a = 4.2 + -0.2b
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