3x+9x+352=526012x-4908=0
x=4908/12
x=40921x-5х-84х=940
-68x-940=0
x=-940/68
x=-235/17x=13 14/17 (~-13.824)
3x+9x+352=5260
12x-4908=0
x=4908/12
x=409
21x-5х-84х=940
-68x-940=0
x=-940/68
x=-235/17
x=13 14/17 (~-13.824)