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x in (-oo:+oo)
-(7*x)-3 = 13/5 // - 13/5
-(7*x)-(13/5)-3 = 0
-7*x-13/5-3 = 0
-7*x-28/5 = 0 // + 28/5
-7*x = 28/5 // : -7
x = 28/5/(-7)
x = -4/5
x = -4/5
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