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x in (-oo:+oo)
4-((5/2)*(1/10)*x) = 1 // - 1
4-((5/2)*(1/10)*x)-1 = 0
(-1/4)*x-1+4 = 0
3-1/4*x = 0 // - 3
-1/4*x = -3 // : -1/4
x = -3/(-1/4)
x = 12
x = 12
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