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Simplifying -126 = 6(-7 + -2a) -126 = (-7 * 6 + -2a * 6) -126 = (-42 + -12a) Solving -126 = -42 + -12a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '12a' to each side of the equation. -126 + 12a = -42 + -12a + 12a Combine like terms: -12a + 12a = 0 -126 + 12a = -42 + 0 -126 + 12a = -42 Add '126' to each side of the equation. -126 + 126 + 12a = -42 + 126 Combine like terms: -126 + 126 = 0 0 + 12a = -42 + 126 12a = -42 + 126 Combine like terms: -42 + 126 = 84 12a = 84 Divide each side by '12'. a = 7 Simplifying a = 7
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