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Simplifying 7(a + -6) = -21 Reorder the terms: 7(-6 + a) = -21 (-6 * 7 + a * 7) = -21 (-42 + 7a) = -21 Solving -42 + 7a = -21 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '42' to each side of the equation. -42 + 42 + 7a = -21 + 42 Combine like terms: -42 + 42 = 0 0 + 7a = -21 + 42 7a = -21 + 42 Combine like terms: -21 + 42 = 21 7a = 21 Divide each side by '7'. a = 3 Simplifying a = 3
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