7(1-x)<span><20-6(x+3)</span>
<span>7-7x<span><20-6x-18</span></span>
<span><span>-7x+6x<span><20-18-7</span></span></span>
<span><span><span>-x<span><-5/:(-1)</span></span></span></span>
<span><span><span><span>x><span>5</span></span></span></span></span>
<span><span><span><span><span>Ответ x принадлижит от -( от пять до бесконечности )</span></span></span></span></span>