<span>2x+y=-1
-x+3y=2
</span><span>2x+y=-1
2x-6y=-4
</span><span>2x+y=-1
2x-6y=-4
</span>
<span><span><span>2x=-1-у
2x=-4</span></span>+6у
-1-у=-4+6у
-у-6у=-4+1
-7у=-3
у=3/7
2х=-1-у
2х=-1-3/7
2х=-10/7
х=-10/7/2=-5/7
</span>
<span>m+0,47+5,062+m+43,295=2m+48,827
х+0,3+0,9007+4,58+3х=4x+5,7807
7с+236,7+2с+0,82+4,325=</span>9c+241,845