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x in (-oo:+oo)
y = (1/7)*(69-(4*x)) // - (1/7)*(69-(4*x))
y-((1/7)*(69-(4*x))) = 0
(-1/7)*(69-4*x)+y = 0
y-1/7*(69-4*x) = 0
y-1/7*(69-4*x) = 0
4/7*x+y-69/7 = 0
4/7*x+y-69/7 = 0
4/7*x+y-69/7 = 0 // - y-69/7
4/7*x = -(y-69/7) // : 4/7
x = (-(y-69/7))/4/7
x = 7/4*(69/7-y)
x = 7/4*(69/7-y)
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