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x in (-oo:+oo)
y = (4/7)*x-6 // - (4/7)*x-6
y-((4/7)*x)+6 = 0
(-4/7)*x+y+6 = 0
y-4/7*x+6 = 0 // - y+6
-4/7*x = -(y+6) // : -4/7
x = (-(y+6))/(-4/7)
x = 7/4*(y+6)
x = 7/4*(y+6)
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