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Simplifying -2b + 7 + -3b = 21 Reorder the terms: 7 + -2b + -3b = 21 Combine like terms: -2b + -3b = -5b 7 + -5b = 21 Solving 7 + -5b = 21 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 + -5b = 21 + -7 Combine like terms: 7 + -7 = 0 0 + -5b = 21 + -7 -5b = 21 + -7 Combine like terms: 21 + -7 = 14 -5b = 14 Divide each side by '-5'. b = -2.8 Simplifying b = -2.8
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