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x in (-oo:+oo)
-7/10 = x/15 // - x/15
-(x/15)-7/10 = 0
-1/15*x-7/10 = 0 // + 7/10
-1/15*x = 7/10 // : -1/15
x = 7/10/(-1/15)
x = -21/2
x = -21/2
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