1) <span>-3.4x=12.07</span>
x = 12.07/(-3.4)
x = -3.55
2)<span>(5.6-8x):4=1.2</span>
<span>5.6-8x = 4*1.2</span>
<span>5.6-8x = 4.8</span>
<span>8x =5.6-4.8</span>
<span>8x = 0.8</span>
<span>x =0.1</span>
<span>3)<span>(0.35-у):0.05=6</span></span>
<span><span>0.35-у = 6*0.05</span></span>
<span><span>0.35-у = 0.3</span></span>
<span><span>y = 0.03</span></span>
<span><span>4)<span>5(x+2)=4(3-x)+7</span></span></span>
<span><span><span>5x+10= 19-4x</span></span></span>
<span><span><span>9x=9</span></span></span>
<span><span><span>x=1</span></span></span>