300-78: х =287 750+10*х=750

Question

300-78: х =287 750+10*х=750

Answer 1

300-78:х=287
78/х=300-287
78/х=13
х=78/13
х=6
ответ:6

750+10*х=750
10*х=750-750
10*х=0
х=0