2x + 4 - 49 = 0
2x = 45
x=22.5
0,6х-3,6х=0
х(0,6-3,6)=0
х(-(3,6-0,6))=0
-3х=0
х=0:(-3)
х=0
<span>x^2+y^2+2xy-(x+y)^3=(x+y)</span><span>²-(x+y)</span><span>³=(x+y)</span><span>²(1-x-y)=(x+y)(x+y)(1-x-y)</span>
(a-b)^3-a^2+2ab-b^2=(a-b)³-(a-b)²=(a-b)(a-b)(a-b-1)
<span>a^2-b^2-(a-b)^3=(a-b)(a+b)-(a-b)</span>³=(a-b)(a+b-a²+2ab-b²)