Question

2x+8=7x-12 || -m/4+5=2 || 3x-8=-17 ||

Answer 1

2x+8=7x-12    we put the x in a side  and the number in the other side 
5x = 20 
x= 20/5 = 4

 -m/4+5=2
 common denominator
-m /4  + 20/4 = 2/4   
-m +20 = 2

m = 20-2 =18

3x-8=-17

3x = -17 +8 

3x = -9 

x= -9/3 = -3