Решите уравнение
1) 17n + 14n - 145 = 134
2) (x + 57) : 7 = 12
3) 112 : (17 + x) = 4

17n+14n-145=13417n+14n=134+14531n=279n=279:31n=9(x+57):7=12x+57=12•7x+57=84x=84-57x=27112:(17+x)=417+x=112:417+x=28x=28-17x=11