1) 9*(x+7)=-x
9x+63=-x
9x+x=-63
10x=-63
х=-63/10
x=-6,3
2) 5-2x=8x+9
-2x-8x=9-5
-10x=4
х=-0,4
3) x+9=-9x
х+9x=-9
10x=-9
x=-0,9
1) 9*(x+7)=-x
9x+63=-x
9x+x=-63
10x=-63
х=-63/10
x=-6,3
2) 5-2x=8x+9
-2x-8x=9-5
-10x=4
х=-0,4
3) x+9=-9x
х+9x=-9
10x=-9
x=-0,9