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x in (-oo:+oo)
(-7/17)*x = -4 // + 4
(-7/17)*x+4 = 0
4-7/17*x = 0 // - 4
-7/17*x = -4 // : -7/17
x = -4/(-7/17)
x = 68/7
x = 68/7
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