Question

x+3<5.7(x+10)+2.4

 

Answer 1

x+3<5.7(x+10)+2.4
x+3<5,7x+57+2,4
x-5,7x<59,4-3
-4,7x<56,4 |:(-4,7)
x>-12
 Ответ: (-12; +∞).

Answer 2

x+3<5.7(x+10)+2.4 
x+3<5.7x+57+2.4
x-5.7x<57+2,4-3
-4.7x<56,4
4.7x>-56,4
x> - 56,44.7
x> - 12
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                                  -12