a) 3(x-1)+2<7x-13
3x-3+2<7x-13
3x-1<7x-13
3x-7x< -13+1
-4x< -12/ ×(-1)
4x>12
x>3
x∈{3,4,5,6,.....}
b) 5x-1/8- x-2/2+3=3x-7/4-x/2
5x-1/8- 4(x-2)/8+24/8=2(3x-7)/8-4x/8
5x-1-4(x-2)+24=2(3x-7)-4x
5x-1-4x+8+24=6x-14-4x
x+31=2x-14
x-2x= -14-31
-x= -45
x=45
c) 2(x+3)-3(5-x)=11+2x-2(3+x)
2x+6-15+3x=11+2x-6-2x
5x-9=5
5x=14
x=14/5