3(4х+13)-25=74
12х+39-25=74
12х=74+25-39
12х=60
х=60:12
х=5
проверка
3(4*5+13)-25=74
3(20+13)-25=74
3*33-25=74
99-25=74
74=74
3(4х+13)-25=7412x+39-25=7412x=74-39+2512x=60x=60/12x=5
3(4х+13)-25=74
12х+39-25=74
12х=74+25-39
12х=60
х=60:12
х=5
проверка
3(4*5+13)-25=74
3(20+13)-25=74
3*33-25=74
99-25=74
74=74
3(4х+13)-25=74
12x+39-25=74
12x=74-39+25
12x=60
x=60/12
x=5