<span>x+7/3-x/5=8 | * 15
15x+35-3x=120
12x=120-35
12x=85
x = 85/12
</span><span>13+х/4=х+1 | *4
</span>52+x=4x+4
x-4x=4-52
-3x=-48
x = -48 / (-3)
x = 16
4x-3y=12 /.4
3x+4y=-66 /.3
16x-12y=48
9x + 12y=-198 /+
---------------------------
25x=-150, x=-6
3y=4x-12,3y=4.(-6)-12=-24-12=-36,3y=-36,y=-12
/x,y/=/-6,-12/
0.36x^8−20.4x^4y^3+289y^6=(0.6x^4-17y^3)^2