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Simplifying 7 + -1b = 21 Solving 7 + -1b = 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 + -1b = 21 + -7 Combine like terms: 7 + -7 = 0 0 + -1b = 21 + -7 -1b = 21 + -7 Combine like terms: 21 + -7 = 14 -1b = 14 Divide each side by '-1'. b = -14 Simplifying b = -14
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