3x-6+x-7<2x+15-5x
3x+x-2x+5x<15+6+7
7x<28
x<4
x∈(-∞;4)
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3x-6+x-7<2x+15-5x
3x+x-2x+5x<15+6+7
7x<28
x<4
x∈(-∞;4)