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Simplifying 4a + -21 = -1 Reorder the terms: -21 + 4a = -1 Solving -21 + 4a = -1 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 + 21 + 4a = -1 + 21 Combine like terms: -21 + 21 = 0 0 + 4a = -1 + 21 4a = -1 + 21 Combine like terms: -1 + 21 = 20 4a = 20 Divide each side by '4'. a = 5 Simplifying a = 5
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