<span>1.)9х-7=6х+14</span>
<span>9х-6х=14+7</span>
<span>3х=21</span>
<span>х=21:3</span>
<span>х=7</span>
<span><span>2) (12у+18)(1.6-0.2у)=0</span></span>
<span><span>12у+18=0 1,6-0,2у=0</span></span>
<span><span>12у=-18 -0,2у=-1,6</span></span>
<span><span>у=-18:12 у=-1,6:(-0,2)</span></span>
<span><span>у=-1,5 у=8</span></span>