2,34x+2,66x=2,8
5x-2.8=0
x=2.8/5
x=0.56
<span>3y+9y-5,8=3.8</span>
<span>12y-5.8-3.8=0</span>
<span>12y-9.6=0</span>
y=9.6/12
y=0.8