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Simplifying -7a + -3(a + -7) = 81 Reorder the terms: -7a + -3(-7 + a) = 81 -7a + (-7 * -3 + a * -3) = 81 -7a + (21 + -3a) = 81 Reorder the terms: 21 + -7a + -3a = 81 Combine like terms: -7a + -3a = -10a 21 + -10a = 81 Solving 21 + -10a = 81 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + -10a = 81 + -21 Combine like terms: 21 + -21 = 0 0 + -10a = 81 + -21 -10a = 81 + -21 Combine like terms: 81 + -21 = 60 -10a = 60 Divide each side by '-10'. a = -6 Simplifying a = -6
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