Odpowiedź:
1) 4(x-1) = 2(x+5)
4x-4=2x+10
4x-2x=4+10
2x=14/:2
x=7
2) 3x+ 2(x+3) = 3(x-2)
3x+2x+6=3x-6
5x-3x=-6-6
2x=-12/:2
x=-6
3) -2(x-5) = 3(2x+10)
-2x+10=6x+30
4x=-10+30
4x=20/:4
x=5
4) 10 – 5 (2x-4) = -2 (3x +1)
10-10x+20=-6x-2
10+20+2=10x-6x
32=16x/:16
x=2
5) 2(x-1) +3x = 4(x+1)
2x-2+3x=4x+4
5x-4x=2+4
x=6
6) (x -3)(2x-3) = (2x+3)(x-4)
2x²-3x-6x+9=2x²-8x+3x-12
2x²-2x²-3x-6x+8x-3x=-9-12
-12x+8x=-21
-4x=-21/· (-1)
4x=21/:4
x=5,25
