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x in (-oo:+oo)
x-((1/2)*(2*x+5*x-4)) = -1 // + 1
x-((1/2)*(2*x+5*x-4))+1 = 0
(-1/2)*(2*x+5*x-4)+x+1 = 0
x-1/2*(7*x-4)+1 = 0
x-1/2*(7*x-4)+1 = 0
1-5/2*x+2 = 0
3-5/2*x = 0
3-5/2*x = 0
3-5/2*x = 0 // - 3
-5/2*x = -3 // : -5/2
x = -3/(-5/2)
x = 6/5
x = 6/5
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