Решите уровнения. (х+240)*3=1260 х+(240*3)=1260 х+240=1260*3 зарание : **

(Х+240)*3=1260                  
Х+240=1260/3=420
x = 420 - 240 = 180
x=180

Х+(240*3)=1260              
Х+720=1260 
x = 1260-720 = 540
x = 540

Х+240=1260*3        
Х+240=3780
x = 3780 -240 = 3540
x = 3540

3x+720=1260
3x=540
x=180

x+720=1260
x=540

x+240=3780
x=3540