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Simplifying -7(b + -7) + -8b = 139 Reorder the terms: -7(-7 + b) + -8b = 139 (-7 * -7 + b * -7) + -8b = 139 (49 + -7b) + -8b = 139 Combine like terms: -7b + -8b = -15b 49 + -15b = 139 Solving 49 + -15b = 139 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-49' to each side of the equation. 49 + -49 + -15b = 139 + -49 Combine like terms: 49 + -49 = 0 0 + -15b = 139 + -49 -15b = 139 + -49 Combine like terms: 139 + -49 = 90 -15b = 90 Divide each side by '-15'. b = -6 Simplifying b = -6
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