* - razy
2 po x to potęga
6x-2=5x-4 /+2
6x=5x-2
6x-5x=-2
-x=-2
x=2
x- 2x+1 / 3 =1/4 /*12
12x - 4*(2x+1)=3
12x- 8x -4 = 3
4x-4=3
4x=3+4
4x=7 /:4
x=7/4
x= 1 3/4
4x-x(x-2)+(x2 -7) = 2(x+1)-x(x-4)
4x-x2+2x+x2-7=2x+2-x2+4x
6x-7=6x+2-x2 /-6x
-7=2-x2
x2=2+7
x2=9
x=3
