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x in (-oo:+oo)
A = (7/2)*(x-45) // - (7/2)*(x-45)
A-((7/2)*(x-45)) = 0
(-7/2)*(x-45)+A = 0
A-7/2*(x-45) = 0
A-7/2*(x-45) = 0
A-7/2*x+315/2 = 0
A-7/2*x+315/2 = 0
A-7/2*x+315/2 = 0 // - A+315/2
-7/2*x = -(A+315/2) // : -7/2
x = (-(A+315/2))/(-7/2)
x = 2/7*(A+315/2)
x = 2/7*(A+315/2)
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