<span>-8х+15=-4х+60</span>
<span>-8х+4х=60-15</span>
<span>-4х=45</span>
<span>х=45/(-4)</span>
<em><u><span>х=-11,25</span></u></em>
<u><em><span><span>5/6х + 7=5/9х -5</span></span></em></u>
<span><span>5/6х-5/9х=-5-7</span></span>
<span><span>5/6х-5/9х=-12- обе части уравнения умножим на 18х не=0 х не=0</span></span>
<span><span>15-10=-216х</span></span>
<span><span>-216х=5</span></span>
<span><span>х=5/(-216)</span></span>
<em><u><span><span>х=-0,0231</span></span></u></em>
<em><u /></em><span><span>если уравнение такого вида</span></span>
<em><u /><u /><u><span><span>5/(6х + 7)=5/(9х -5)</span></span></u></em>
<span><span>5*(9х-5)=5*(6х+7)</span></span>
<span><span>9х-5=6х+7</span></span>
<span><span>9х-6х=7+5</span></span>
<span><span>3х=12</span></span>
<em><u><span><span>х=12/3</span></span></u></em>
<em><u><span><span>х=4</span></span></u></em>