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x in (-oo:+oo)
-10*(7/2) = ((2*(7/2))/7)*x // - ((2*(7/2))/7)*x
-(((2*(7/2))/7)*x)-10*(7/2) = 0
-x-10*(7/2) = 0
-x-35 = 0 // + 35
-x = 35 // * -1
x = -35
x = -35
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