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Simplifying 4a + -1b + 21 = 0 Reorder the terms: 21 + 4a + -1b = 0 Solving 21 + 4a + -1b = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + 4a + -21 + -1b = 0 + -21 Reorder the terms: 21 + -21 + 4a + -1b = 0 + -21 Combine like terms: 21 + -21 = 0 0 + 4a + -1b = 0 + -21 4a + -1b = 0 + -21 Combine like terms: 0 + -21 = -21 4a + -1b = -21 Add 'b' to each side of the equation. 4a + -1b + b = -21 + b Combine like terms: -1b + b = 0 4a + 0 = -21 + b 4a = -21 + b Divide each side by '4'. a = -5.25 + 0.25b Simplifying a = -5.25 + 0.25b
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