ответ:4x+2x=66
6x=66
x=66/6
x=11
25x+6x=124
31x=124
x=124/31
x=4
30y-5y=600
25y=600
y=600/25
y=24
19a+7a=364
26a=364
a=364/26
a=14
m+7m=96
8m=96
m=96/8
m=12
13b-b=156
12b=156
b=156/12
b=13
