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Simplifying 3(a + -4) = -21 Reorder the terms: 3(-4 + a) = -21 (-4 * 3 + a * 3) = -21 (-12 + 3a) = -21 Solving -12 + 3a = -21 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + 3a = -21 + 12 Combine like terms: -12 + 12 = 0 0 + 3a = -21 + 12 3a = -21 + 12 Combine like terms: -21 + 12 = -9 3a = -9 Divide each side by '3'. a = -3 Simplifying a = -3
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