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Simplifying -140 = 7(-4 + 8a) -140 = (-4 * 7 + 8a * 7) -140 = (-28 + 56a) Solving -140 = -28 + 56a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-56a' to each side of the equation. -140 + -56a = -28 + 56a + -56a Combine like terms: 56a + -56a = 0 -140 + -56a = -28 + 0 -140 + -56a = -28 Add '140' to each side of the equation. -140 + 140 + -56a = -28 + 140 Combine like terms: -140 + 140 = 0 0 + -56a = -28 + 140 -56a = -28 + 140 Combine like terms: -28 + 140 = 112 -56a = 112 Divide each side by '-56'. a = -2 Simplifying a = -2
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