Question

решите уравнение (21x-5)-(15x+4)=27

Answer 1

21x-5-15x-4=27; 21x-15x=27+4+5; 6x=36; x=36/6=6. Ответ: x=6.

Answer 2

(21x-5)-(15x+4)=27
21х-5-15х-4=27
6х-9=27
6х=27+9
6х=36
х=6