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Simplifying 140 = -7(-8 + 2a) 140 = (-8 * -7 + 2a * -7) 140 = (56 + -14a) Solving 140 = 56 + -14a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '14a' to each side of the equation. 140 + 14a = 56 + -14a + 14a Combine like terms: -14a + 14a = 0 140 + 14a = 56 + 0 140 + 14a = 56 Add '-140' to each side of the equation. 140 + -140 + 14a = 56 + -140 Combine like terms: 140 + -140 = 0 0 + 14a = 56 + -140 14a = 56 + -140 Combine like terms: 56 + -140 = -84 14a = -84 Divide each side by '14'. a = -6 Simplifying a = -6
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