Question

1+8(-x+10)=9
Найдите корень уравнения:

Answer 1

1-8х+80=9
1+80-9=8х
8х=72
х=72/8
х=9

Answer 2

9(х+10)=9
-9х+90=9
-9х=9-90
-9х=-81
х=-9