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x in (-oo:+oo)
(7/5)*x+(3/8)*y = -211/20 // + -211/20
(7/5)*x+(3/8)*y-(-211/20) = 0
(7/5)*x+(3/8)*y+211/20 = 0
7/5*x+3/8*y+211/20 = 0 // - 3/8*y+211/20
7/5*x = -(3/8*y+211/20) // : 7/5
x = (-(3/8*y+211/20))/7/5
x = -5/7*(3/8*y+211/20)
x = -5/7*(3/8*y+211/20)
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