\left \{ {{7-x>0} \atop {7-x= 2^{5} }} \right. => \left \{ {{x<7} \atop {x=-25}} \right. " alt="log_{2} (7-x)=log_{2} 2^{5} => \left \{ {{7-x>0} \atop {7-x= 2^{5} }} \right. => \left \{ {{x<7} \atop {x=-25}} \right. " align="absmiddle" class="latex-formula">.Откуда х=-25