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Simplifying 7b + -21 = 2b + 4 Reorder the terms: -21 + 7b = 2b + 4 Reorder the terms: -21 + 7b = 4 + 2b Solving -21 + 7b = 4 + 2b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-2b' to each side of the equation. -21 + 7b + -2b = 4 + 2b + -2b Combine like terms: 7b + -2b = 5b -21 + 5b = 4 + 2b + -2b Combine like terms: 2b + -2b = 0 -21 + 5b = 4 + 0 -21 + 5b = 4 Add '21' to each side of the equation. -21 + 21 + 5b = 4 + 21 Combine like terms: -21 + 21 = 0 0 + 5b = 4 + 21 5b = 4 + 21 Combine like terms: 4 + 21 = 25 5b = 25 Divide each side by '5'. b = 5 Simplifying b = 5
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