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x in (-oo:+oo)
2*(0.105-(x/2)) = 0
2*(0.105-1/2*x) = 0
( 0.105-1/2*x )
0.105-1/2*x = 0 // - 0.105
-1/2*x = -0.105 // : -1/2
x = -0.105/(-1/2)
x = 0.21
( 2 )
2 = 0
x belongs to the empty set
x = 0.21
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