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x in (-oo:+oo)
5*(q+2) = x-(11/2) // - x-(11/2)
5*(q+2)-x+11/2 = 0
(2*5*(q+2))/2+(2*(-x))/2+11/2 = 0
2*5*(q+2)+2*(-x)+11 = 0
10*q-2*x+11+20 = 0
10*q-2*x+31 = 0
(10*q-2*x+31)/2 = 0
(10*q-2*x+31)/2 = 0 // * 2
10*q-2*x+31 = 0
10*q-2*x+31 = 0 // - 10*q+31
-2*x = -(10*q+31) // : -2
x = (-(10*q+31))/(-2)
x = (10*q+31)/2
x = (10*q+31)/2
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