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x in (-oo:+oo)
y-12 = (7/200)*x-800 // - (7/200)*x-800
y-((7/200)*x)-12+800 = 0
(-7/200)*x+y-12+800 = 0
y-7/200*x+788 = 0 // - y+788
-7/200*x = -(y+788) // : -7/200
x = (-(y+788))/(-7/200)
x = 200/7*(y+788)
x = 200/7*(y+788)
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