Question

21 : ( x - 7 ) = 7 решите уравнение

Answer 1

21 : (х-7) = 7
х-7 = 21:7
х-7 = 3
х= 7+3
х=10

Answer 2

21:(х-7)=7
21=7(х-7)
21=7х-49
7х-49=21
7х=21+49
7х=70
х=10