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Simplifying 4a + -21 = 3 + -2a Reorder the terms: -21 + 4a = 3 + -2a Solving -21 + 4a = 3 + -2a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '2a' to each side of the equation. -21 + 4a + 2a = 3 + -2a + 2a Combine like terms: 4a + 2a = 6a -21 + 6a = 3 + -2a + 2a Combine like terms: -2a + 2a = 0 -21 + 6a = 3 + 0 -21 + 6a = 3 Add '21' to each side of the equation. -21 + 21 + 6a = 3 + 21 Combine like terms: -21 + 21 = 0 0 + 6a = 3 + 21 6a = 3 + 21 Combine like terms: 3 + 21 = 24 6a = 24 Divide each side by '6'. a = 4 Simplifying a = 4
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