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Simplifying 20 + -7b = 6b + 21 Reorder the terms: 20 + -7b = 21 + 6b Solving 20 + -7b = 21 + 6b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-6b' to each side of the equation. 20 + -7b + -6b = 21 + 6b + -6b Combine like terms: -7b + -6b = -13b 20 + -13b = 21 + 6b + -6b Combine like terms: 6b + -6b = 0 20 + -13b = 21 + 0 20 + -13b = 21 Add '-20' to each side of the equation. 20 + -20 + -13b = 21 + -20 Combine like terms: 20 + -20 = 0 0 + -13b = 21 + -20 -13b = 21 + -20 Combine like terms: 21 + -20 = 1 -13b = 1 Divide each side by '-13'. b = -0.07692307692 Simplifying b = -0.07692307692
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