<span>10x-5=6(8x+3)-5x</span>
<span>10х-5=48х+18-5х</span>
<span>11х-43х=18+5</span>
<span>-33х=23</span>
<span>х=-23/33</span>
<span>
</span>
<span><span>30+5*(3-1)=35-25-здесь нет неизвестного???</span></span>
<span><span>20+15-5=10</span></span>
<span>-10(3-4x)+51=7(5x+3)</span>
<span>-30+40х+51=35х+21</span>
<span>40х-35х=21+30-51</span>
<span>5х=0</span>
<span>х=0</span>
<span>
</span>
<span><span>1,2(a+7)-1,8=1,2а+8,4-1,8=6,6+1,2а</span></span>