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Simplifying -140 = -7(-8 + 4b) -140 = (-8 * -7 + 4b * -7) -140 = (56 + -28b) Solving -140 = 56 + -28b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '28b' to each side of the equation. -140 + 28b = 56 + -28b + 28b Combine like terms: -28b + 28b = 0 -140 + 28b = 56 + 0 -140 + 28b = 56 Add '140' to each side of the equation. -140 + 140 + 28b = 56 + 140 Combine like terms: -140 + 140 = 0 0 + 28b = 56 + 140 28b = 56 + 140 Combine like terms: 56 + 140 = 196 28b = 196 Divide each side by '28'. b = 7 Simplifying b = 7
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