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Simplifying (7b + -3) + (b + -4) = 646 Reorder the terms: (-3 + 7b) + (b + -4) = 646 Remove parenthesis around (-3 + 7b) -3 + 7b + (b + -4) = 646 Reorder the terms: -3 + 7b + (-4 + b) = 646 Remove parenthesis around (-4 + b) -3 + 7b + -4 + b = 646 Reorder the terms: -3 + -4 + 7b + b = 646 Combine like terms: -3 + -4 = -7 -7 + 7b + b = 646 Combine like terms: 7b + b = 8b -7 + 8b = 646 Solving -7 + 8b = 646 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 + 8b = 646 + 7 Combine like terms: -7 + 7 = 0 0 + 8b = 646 + 7 8b = 646 + 7 Combine like terms: 646 + 7 = 653 8b = 653 Divide each side by '8'. b = 81.625 Simplifying b = 81.625
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