<span>1)7,7-(3,8-x)=-1,1;</span>
<span>7,7-3,8+x=-1,1</span>
<span>x=-7,7+3,8-1,1</span>
<span>x=-5</span>
<span><span> 2) -0.2x*(-4)=-0.08</span></span>
0,8x=-0,08
x=0,1
<span>3)3/7*2.8у*(-0.6)=1.44 </span>
<span>0,42*(-1,68y)=1,44</span>
<span>-0,7056y=1,44</span>
<span>y=-2</span>
<span><span>4) 3*(0.4x+7) - 4*(0.8-3)=2 </span></span>
<span><span>1,2x+21-3,2+12=2</span></span>
<span><span>1,2x=-21+3,2-12+2</span></span>
<span><span>1,2x=-27,8</span></span>
<span><span>x=-23,16</span></span>