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Simplifying 7(b + -1) + -4b = 20 Reorder the terms: 7(-1 + b) + -4b = 20 (-1 * 7 + b * 7) + -4b = 20 (-7 + 7b) + -4b = 20 Combine like terms: 7b + -4b = 3b -7 + 3b = 20 Solving -7 + 3b = 20 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + 3b = 20 + 7 Combine like terms: -7 + 7 = 0 0 + 3b = 20 + 7 3b = 20 + 7 Combine like terms: 20 + 7 = 27 3b = 27 Divide each side by '3'. b = 9 Simplifying b = 9
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