49х-3*7х-1=49
49x-21x-1=49
28x-50 = 0
28x = 50
x = 50/28
х=1,78571428571
49x - 21x - 1 = 49
x = 25/14
49х-3*7х-1=49
49x-21x-1=49
28x-50 = 0
28x = 50
x = 50/28
х=1,78571428571
49х-3*7х-1=49
49x - 21x - 1 = 49
28x = 50
x = 25/14