7х+5=5х-3
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7х-5х=-3-5
2х=-8 |:2
х=-4
Ответ: х=-4
Y=6-4x
x²+18x-12x²-36+48x-16x²-3=0
-27x²+66x-39=0
9x²-22x+13=0
D=484-468=16
x1=(22-4)/18=1⇒y1=6-4*1=6-4=2
x2=(22+4)/18=13/9⇒y2=6-4*13/9=2/9
(1;2) U (13/9;2/9)
<span> x^3-3x^2+5x-15 = x^2</span>
<span>(5х-1)^2+(5х-1)(5х+1)=25x^2-10x+1+25x^2-1=50x^2-10x</span>