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Simplifying 133 = -7(2 + -7a) 133 = (2 * -7 + -7a * -7) 133 = (-14 + 49a) Solving 133 = -14 + 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. 133 + -49a = -14 + 49a + -49a Combine like terms: 49a + -49a = 0 133 + -49a = -14 + 0 133 + -49a = -14 Add '-133' to each side of the equation. 133 + -133 + -49a = -14 + -133 Combine like terms: 133 + -133 = 0 0 + -49a = -14 + -133 -49a = -14 + -133 Combine like terms: -14 + -133 = -147 -49a = -147 Divide each side by '-49'. a = 3 Simplifying a = 3
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