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Simplifying 168 = -7(-7b + -3) Reorder the terms: 168 = -7(-3 + -7b) 168 = (-3 * -7 + -7b * -7) 168 = (21 + 49b) Solving 168 = 21 + 49b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-49b' to each side of the equation. 168 + -49b = 21 + 49b + -49b Combine like terms: 49b + -49b = 0 168 + -49b = 21 + 0 168 + -49b = 21 Add '-168' to each side of the equation. 168 + -168 + -49b = 21 + -168 Combine like terms: 168 + -168 = 0 0 + -49b = 21 + -168 -49b = 21 + -168 Combine like terms: 21 + -168 = -147 -49b = -147 Divide each side by '-49'. b = 3 Simplifying b = 3
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