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Simplifying 3b + 15 = 7b + -21 Reorder the terms: 15 + 3b = 7b + -21 Reorder the terms: 15 + 3b = -21 + 7b Solving 15 + 3b = -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. 15 + 3b + -7b = -21 + 7b + -7b Combine like terms: 3b + -7b = -4b 15 + -4b = -21 + 7b + -7b Combine like terms: 7b + -7b = 0 15 + -4b = -21 + 0 15 + -4b = -21 Add '-15' to each side of the equation. 15 + -15 + -4b = -21 + -15 Combine like terms: 15 + -15 = 0 0 + -4b = -21 + -15 -4b = -21 + -15 Combine like terms: -21 + -15 = -36 -4b = -36 Divide each side by '-4'. b = 9 Simplifying b = 9
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