54-17:{[36-24x(a-20)]:5+2}=52
-17:{[36-24x(a-20)]:5+2}=52-54
-17:{[36-24x(a-20)]:5+2}= - 2
[36-24x(a-20)]:5+2=17/2
36-24x(a-20)=(17/2-2)x5
36-24x(a-20)=(17-4)/2x5
36-24x(a-20)=13/2x5
-24x(a-20)=65/2-36
-24x(a-20)=(65-2x36)/2
-24x(a-20)=(65-72)/2
-24x(a-20)= - 7/2
A-20=7/2:24
A-20=7/2x1/24
A-20=7/48
A=7/48+20
A=(7+48x20)/48
A=(7+960)/48
A=967/48
