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Simplifying x2 + -1bx + 21 = 0 Reorder the terms: 21 + -1bx + x2 = 0 Solving 21 + -1bx + x2 = 0 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -1bx + -21 + x2 = 0 + -21 Reorder the terms: 21 + -21 + -1bx + x2 = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -1bx + x2 = 0 + -21 -1bx + x2 = 0 + -21 Combine like terms: 0 + -21 = -21 -1bx + x2 = -21 Add '-1x2' to each side of the equation. -1bx + x2 + -1x2 = -21 + -1x2 Combine like terms: x2 + -1x2 = 0 -1bx + 0 = -21 + -1x2 -1bx = -21 + -1x2 Divide each side by '-1x'. b = 21x-1 + x Simplifying b = 21x-1 + x
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