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Simplifying b + 7 + -3b = 15 Reorder the terms: 7 + b + -3b = 15 Combine like terms: b + -3b = -2b 7 + -2b = 15 Solving 7 + -2b = 15 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 + -2b = 15 + -7 Combine like terms: 7 + -7 = 0 0 + -2b = 15 + -7 -2b = 15 + -7 Combine like terms: 15 + -7 = 8 -2b = 8 Divide each side by '-2'. b = -4 Simplifying b = -4
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