<span>1) 3/14=21/2(x+8)</span>
<span>3/14=21/(2х+16)</span>
<span>3(2х+16)=14*21</span>
<span>6х+48=294</span>
<span>6х=294-48</span>
<span>6х=246</span>
<span>х=246/6</span>
<span>х=41</span>
<span>
</span>
<span><span>2) 9/10 = 63/5(x+8) </span></span>
<span><span>9/10=63/(5х+40)</span></span>
<span><span>9(5х+40)=10*63</span></span>
<span><span>45х+360=630</span></span>
<span><span>45х=630-360</span></span>
<span><span>45х=270</span></span>
<span><span>х=270/45</span></span>
<span><span>х=6</span></span>