реши уравнения 1) (20+m) /2=26 2) (45-n) /3=10*3 3) (160+x)-40=300 4) 225 /(c+5=15

1. 20+m=26*2          3.160+x=300+40
20+m=52                  160+x=340
m=52-20                   x=340-160
m=32                         x=180
2. (45-n)/3=30          4. c+5=225/15
45-n=30*3                 c+5=15
45-n=90                     c=15-5
n=90-45                     c=10
n=45