Question

Решите уравнение 2.4х+1.5(х+18)=339

Answer 1

2,4х+1,5х+27=339
3,9х=312
х=80

Answer 2

2.4х+1.5(х+18)=339
2,4х+1,5х+27=339
3,9х+27=339
3,9х=339-27
3,9х=312
х=312/3,9
х=80
проверка 
2,4*80+1,5(80+18)=192+1,5*98=192+147=339
Ответ х=80