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Simplifying 126 = -7(3 + 7a) 126 = (3 * -7 + 7a * -7) 126 = (-21 + -49a) Solving 126 = -21 + -49a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '49a' to each side of the equation. 126 + 49a = -21 + -49a + 49a Combine like terms: -49a + 49a = 0 126 + 49a = -21 + 0 126 + 49a = -21 Add '-126' to each side of the equation. 126 + -126 + 49a = -21 + -126 Combine like terms: 126 + -126 = 0 0 + 49a = -21 + -126 49a = -21 + -126 Combine like terms: -21 + -126 = -147 49a = -147 Divide each side by '49'. a = -3 Simplifying a = -3
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