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Simplifying 57 + -6(a + 4) = 21 Reorder the terms: 57 + -6(4 + a) = 21 57 + (4 * -6 + a * -6) = 21 57 + (-24 + -6a) = 21 Combine like terms: 57 + -24 = 33 33 + -6a = 21 Solving 33 + -6a = 21 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-33' to each side of the equation. 33 + -33 + -6a = 21 + -33 Combine like terms: 33 + -33 = 0 0 + -6a = 21 + -33 -6a = 21 + -33 Combine like terms: 21 + -33 = -12 -6a = -12 Divide each side by '-6'. a = 2 Simplifying a = 2
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