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x in (-oo:+oo)
y = (2/7)*x+3 // - (2/7)*x+3
y-((2/7)*x)-3 = 0
(-2/7)*x+y-3 = 0
y-2/7*x-3 = 0 // - y-3
-2/7*x = -(y-3) // : -2/7
x = (-(y-3))/(-2/7)
x = -7/2*(3-y)
x = -7/2*(3-y)
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