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x in (-oo:+oo)
y = (9/5)*x+32 // - (9/5)*x+32
y-((9/5)*x)-32 = 0
(-9/5)*x+y-32 = 0
y-9/5*x-32 = 0 // - y-32
-9/5*x = -(y-32) // : -9/5
x = (-(y-32))/(-9/5)
x = -5/9*(32-y)
x = -5/9*(32-y)
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