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Simplifying 68 = 0.5 * 4(21 + b) Multiply 0.5 * 4 68 = 2(21 + b) 68 = (21 * 2 + b * 2) 68 = (42 + 2b) Solving 68 = 42 + 2b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-2b' to each side of the equation. 68 + -2b = 42 + 2b + -2b Combine like terms: 2b + -2b = 0 68 + -2b = 42 + 0 68 + -2b = 42 Add '-68' to each side of the equation. 68 + -68 + -2b = 42 + -68 Combine like terms: 68 + -68 = 0 0 + -2b = 42 + -68 -2b = 42 + -68 Combine like terms: 42 + -68 = -26 -2b = -26 Divide each side by '-2'. b = 13 Simplifying b = 13
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