If the tangent to the curve \( y=x^{3}-x^{2}+x \) at the point \( (a, b) \) is also tangent to t...

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If the tangent to the curve \( y=x^{3}-x^{2}+x \) at the point \( (a, b) \) is also tangent to the curve \( y=5 x^{2}+2 x-25 \) at the point (2, \( -1) \), then \( |2 a+9 b| \) is equal to
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