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Simplifying 2a + b + -5c = 21 Solving 2a + b + -5c = 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. 2a + b + -1b + -5c = 21 + -1b Combine like terms: b + -1b = 0 2a + 0 + -5c = 21 + -1b 2a + -5c = 21 + -1b Add '5c' to each side of the equation. 2a + -5c + 5c = 21 + -1b + 5c Combine like terms: -5c + 5c = 0 2a + 0 = 21 + -1b + 5c 2a = 21 + -1b + 5c Divide each side by '2'. a = 10.5 + -0.5b + 2.5c Simplifying a = 10.5 + -0.5b + 2.5c
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