2(x+1)-1<7+8x
2x+2-1<7+8x
2x-8x<7-2+1
-6x<6
x>-1
x∈(-1;+∞)
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2(x+1)-1<7+8x
2x+2-1<7+8x
2x-8x<7-2+1
-6x<6
x>-1
x∈(-1;+∞)