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5*2x-4*15<5*4x
10x-20x<70
-10x<70 /:(-10)
x>-7
3x/4-3>2x/5 /*20
5*3x-3*20>4*2x
15x-8x>60
7x>60
x>60/7
2x/6-2<5x/3 /*3
x-6<5x
x-5x<6
-4x<6 /:(-4)
x> -3/2
x>-1,5