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x in (-oo:+oo)
x+x+x-145 = x/2 // - x/2
x+x+x-(x/2)-145 = 0
5/2*x-145 = 0 // + 145
5/2*x = 145 // : 5/2
x = 145/5/2
x = 58
x = 58
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