a).
[(x+25)*3]-100=17
(x+25)*3=117
x+25=117/3
x+25=39
x=39-25
x=14
b).[(x+19)*3]+11=103*2
(x+19)*3+11=206
(x+19)*3=195
x+19=195/3
x+19=65
x=65-19
x=46
c).(440/4-50*2)+1/3*x=21
(110-25)+1/3*x=21
85+1/3*x=21
1/3*x=21-85
1/3*x= -64
x= -64*3
x= -192
d).(x/5+6)*8-190=186
(x/5+6)*8=376
(x/5+6)=376/8
x/5+6=47
x/5=47-6
x/5=41
x=41*5
x=205