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x/5-2(x+1)/15>1/5(1+x) /*15
3x - 2(x +1) > 3(1 +x)
3x -2x - 2 > 3 +3x
x -3x > 3 +2
-2x > 5 /:(-2)
x < ( - 5/2)
inaczej x∈ ( -∞, -5/2)