11x²+8y²-4x+28y-16=0
s-8=\frac{t^2+8s}{20}
1/x=0.6
4x − 3y = 1, 4y − 5x = 2
2Y-X=10
X+Y=4
2/3*5
250=80t+250t^2
2(1-2x)/3-2x=.2/5+4(2-3x)/3
x^2 + x = 30
