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x in (-oo:+oo)
(-4/5)*x+5/7 = -199/35 // + -199/35
(-4/5)*x+5/7-(-199/35) = 0
(-4/5)*x+5/7+199/35 = 0
32/5-4/5*x = 0 // - 32/5
-4/5*x = -32/5 // : -4/5
x = -32/5/(-4/5)
x = 8
x = 8
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