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x in (-oo:+oo)
y = (4*x)/8+83+88+90+91 // - (4*x)/8+83+88+90+91
y-((4*x)/8)-91-90-88-83 = 0
(-1/2)*x+y-91-90-88-83 = 0
y-1/2*x-352 = 0 // - y-352
-1/2*x = -(y-352) // : -1/2
x = (-(y-352))/(-1/2)
x = -2*(352-y)
x = -2*(352-y)
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