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x in (-oo:+oo)
y = (1/3)*x+100 // - (1/3)*x+100
y-((1/3)*x)-100 = 0
(-1/3)*x+y-100 = 0
y-1/3*x-100 = 0 // - y-100
-1/3*x = -(y-100) // : -1/3
x = (-(y-100))/(-1/3)
x = -3*(100-y)
x = -3*(100-y)
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