Question

как сделать уравнение (8х+91):7=21

Answer 1

(8х+91):7=21
(8х+91)=21*7
8х+91=147
8х=147-91
8х=56
х=56:8
х=7

Answer 2

(8x+91)/7=218x+91=21*78x+91=1478x=147-918x=56x=56/8x=7