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