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Simplifying 3(a + -5) = -21 Reorder the terms: 3(-5 + a) = -21 (-5 * 3 + a * 3) = -21 (-15 + 3a) = -21 Solving -15 + 3a = -21 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + 3a = -21 + 15 Combine like terms: -15 + 15 = 0 0 + 3a = -21 + 15 3a = -21 + 15 Combine like terms: -21 + 15 = -6 3a = -6 Divide each side by '3'. a = -2 Simplifying a = -2
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