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x in (-oo:+oo)
278 = 3*(x/2)-x // - 3*(x/2)-x
x-(3*(x/2))+278 = 0
(-3/2)*x+x+278 = 0
278-1/2*x = 0 // - 278
-1/2*x = -278 // : -1/2
x = -278/(-1/2)
x = 556
x = 556
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