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Simplifying 4a + -5 = 21 Reorder the terms: -5 + 4a = 21 Solving -5 + 4a = 21 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + 4a = 21 + 5 Combine like terms: -5 + 5 = 0 0 + 4a = 21 + 5 4a = 21 + 5 Combine like terms: 21 + 5 = 26 4a = 26 Divide each side by '4'. a = 6.5 Simplifying a = 6.5
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