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Simplifying 100 = b + (-72) 100 = b + -72 Reorder the terms: 100 = -72 + b Solving 100 = -72 + b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-1b' to each side of the equation. 100 + -1b = -72 + b + -1b Combine like terms: b + -1b = 0 100 + -1b = -72 + 0 100 + -1b = -72 Add '-100' to each side of the equation. 100 + -100 + -1b = -72 + -100 Combine like terms: 100 + -100 = 0 0 + -1b = -72 + -100 -1b = -72 + -100 Combine like terms: -72 + -100 = -172 -1b = -172 Divide each side by '-1'. b = 172 Simplifying b = 172
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