<span>79-3x=8</span>
<span>-3х=8-79</span>
<span>-3х=-71</span>
<span>-х=-71:3</span>
<span>-х=-23 ц 2/3</span>
<span>х=23 ц 2 \3 </span>
<span>или так </span>
<span>79-3x=8</span>
<span>79-8=3х</span>
3х=71
х=71\3
х=23 ц 2\3
127у = 139
у = 139/127
х = (13 - 8у) : 7
х = (13 -1112/127 ) : 7
х = 539/127 :7
х = 77/127
(-60a+6(a+5))^2= (-60a+6a+30)^2=(-54a+30)^2=2916a^2+900=972a^2+300