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x in (-oo:+oo)
45*x = 120/2 // - 120/2
45*x-(120/2) = 0
45*x-60 = 0
45*x-60 = 0 // + 60
45*x = 60 // : 45
x = 60/45
x = 4/3
x = 4/3
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