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x in (-oo:+oo)
2*(120-((5*x)/10)) = 0
2*((-1/2)*x+120) = 0
2*(120-1/2*x) = 0
( 120-1/2*x )
120-1/2*x = 0 // - 120
-1/2*x = -120 // : -1/2
x = -120/(-1/2)
x = 240
( 2 )
2 = 0
x belongs to the empty set
x = 240
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