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Simplifying 126 = -7(-5a + -3) Reorder the terms: 126 = -7(-3 + -5a) 126 = (-3 * -7 + -5a * -7) 126 = (21 + 35a) Solving 126 = 21 + 35a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-35a' to each side of the equation. 126 + -35a = 21 + 35a + -35a Combine like terms: 35a + -35a = 0 126 + -35a = 21 + 0 126 + -35a = 21 Add '-126' to each side of the equation. 126 + -126 + -35a = 21 + -126 Combine like terms: 126 + -126 = 0 0 + -35a = 21 + -126 -35a = 21 + -126 Combine like terms: 21 + -126 = -105 -35a = -105 Divide each side by '-35'. a = 3 Simplifying a = 3
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