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5y-4=7x
4x²+25-30=4x²+18x
5y=7x+4
-18x=5/:(-18)
5y=7x+4
x=-5/18
5y=7*(-5/18)+4
x=-5/18
5y=-35/18+4
x=-5/18
5y=3 i 17/18/:5
x=5/18
y=71/90
6(x+y)=10y
y-x=0,5
6x+6y=10y
y-x=0,5/*6
6x+6y-10y=0
6y-6x=3 +
--------------------
6y-10y+6y=3
2y=3/:2
y=1,5
y-x=0,5
1,5-x=0,5
-x=0,5-1,5
-x=-2/:(-1)
x=2
y=1,5