Question

3x/4menor que 9 me ajudem

Answer 1

3x/4   <  9

3x  < 4*9

3x  < 36

x < 36/3

x < 12

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(5x+3)/3 <10
 5x+3<30 
 5x<27
 x<27/5

Answer 2

3x/4 < 9
3x < 4.9
3x < 36
x < 36/3
x< 12

Resp.: {x E R/ x < 12}