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Simplifying 6b + 18 = 7b + -21 Reorder the terms: 18 + 6b = 7b + -21 Reorder the terms: 18 + 6b = -21 + 7b Solving 18 + 6b = -21 + 7b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-7b' to each side of the equation. 18 + 6b + -7b = -21 + 7b + -7b Combine like terms: 6b + -7b = -1b 18 + -1b = -21 + 7b + -7b Combine like terms: 7b + -7b = 0 18 + -1b = -21 + 0 18 + -1b = -21 Add '-18' to each side of the equation. 18 + -18 + -1b = -21 + -18 Combine like terms: 18 + -18 = 0 0 + -1b = -21 + -18 -1b = -21 + -18 Combine like terms: -21 + -18 = -39 -1b = -39 Divide each side by '-1'. b = 39 Simplifying b = 39
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