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Simplifying 39 + -4b = -7(b + -3) Reorder the terms: 39 + -4b = -7(-3 + b) 39 + -4b = (-3 * -7 + b * -7) 39 + -4b = (21 + -7b) Solving 39 + -4b = 21 + -7b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '7b' to each side of the equation. 39 + -4b + 7b = 21 + -7b + 7b Combine like terms: -4b + 7b = 3b 39 + 3b = 21 + -7b + 7b Combine like terms: -7b + 7b = 0 39 + 3b = 21 + 0 39 + 3b = 21 Add '-39' to each side of the equation. 39 + -39 + 3b = 21 + -39 Combine like terms: 39 + -39 = 0 0 + 3b = 21 + -39 3b = 21 + -39 Combine like terms: 21 + -39 = -18 3b = -18 Divide each side by '3'. b = -6 Simplifying b = -6
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