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Simplifying -7(a + -7) = 105 Reorder the terms: -7(-7 + a) = 105 (-7 * -7 + a * -7) = 105 (49 + -7a) = 105 Solving 49 + -7a = 105 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-49' to each side of the equation. 49 + -49 + -7a = 105 + -49 Combine like terms: 49 + -49 = 0 0 + -7a = 105 + -49 -7a = 105 + -49 Combine like terms: 105 + -49 = 56 -7a = 56 Divide each side by '-7'. a = -8 Simplifying a = -8
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