2х-1=8
2х=9
х=4,5
2х-1=-5
2х=-4
х=-2
5x(a+b)-a-b=5x(a+b)-(a+b)=(a+b)(5x-1)
3m(x+y)-x-y=3m(x+y)-(x+y)=(3m-1)(x+y)
x(a-b)+a-b=x(a-b)+(a-b)=(x+1)(a-b)
4y(k-p)-k+p=4y(k-p)-(k-p)=(4y-1)(k-p)
<span>2a(x-y)-x+y=2a(x-y)-(x-y)=(2a-1)(x-y)</span>
<span>21-5(n+8)=-44
21-5n-40=-44
-5n=-44-21+40
-5n=-25
n=-25:(-5)
n=5</span>