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Simplifying 21 = 5a + -4 Reorder the terms: 21 = -4 + 5a Solving 21 = -4 + 5a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-5a' to each side of the equation. 21 + -5a = -4 + 5a + -5a Combine like terms: 5a + -5a = 0 21 + -5a = -4 + 0 21 + -5a = -4 Add '-21' to each side of the equation. 21 + -21 + -5a = -4 + -21 Combine like terms: 21 + -21 = 0 0 + -5a = -4 + -21 -5a = -4 + -21 Combine like terms: -4 + -21 = -25 -5a = -25 Divide each side by '-5'. a = 5 Simplifying a = 5
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