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Simplifying 2a + 5b = -21 Solving 2a + 5b = -21 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-5b' to each side of the equation. 2a + 5b + -5b = -21 + -5b Combine like terms: 5b + -5b = 0 2a + 0 = -21 + -5b 2a = -21 + -5b Divide each side by '2'. a = -10.5 + -2.5b Simplifying a = -10.5 + -2.5b
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