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Simplifying 5a + 13 + -21 = 42 Reorder the terms: 13 + -21 + 5a = 42 Combine like terms: 13 + -21 = -8 -8 + 5a = 42 Solving -8 + 5a = 42 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + 5a = 42 + 8 Combine like terms: -8 + 8 = 0 0 + 5a = 42 + 8 5a = 42 + 8 Combine like terms: 42 + 8 = 50 5a = 50 Divide each side by '5'. a = 10 Simplifying a = 10
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