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x in (-oo:+oo)
98/2 = 10*x+x // - 10*x+x
98/2-(10*x)-x = 0
98/2-10*x-x = 0
49-11*x = 0 // - 49
-11*x = -49 // : -11
x = -49/(-11)
x = 49/11
x = 49/11
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