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x in (-oo:+oo)
(-3/7)*x+1/5 = -173/35 // + -173/35
(-3/7)*x+1/5-(-173/35) = 0
(-3/7)*x+1/5+173/35 = 0
36/7-3/7*x = 0 // - 36/7
-3/7*x = -36/7 // : -3/7
x = -36/7/(-3/7)
x = 12
x = 12
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