12-2(x-1)
12-2(x-2)2= 4(x-2)-(x-3)(2x-5)
12-2(x2-4x+4)= 4x-8-(2x2-5-6x+15)
12-2x2+8x-8=4x-8-2x2+5+6x-15
2x2 sie skroca
4+8x=10x-18 |-4
8x=10x-22 |-10x
-2x=-22 |:-2
x=11
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12-2(x-2)2= 4(x-2)-(x-3)(2x-5)
12-2(x2-4x+4)= 4x-8-(2x2-5-6x+15)
12-2x2+8x-8=4x-8-2x2+5+6x-15
2x2 sie skroca
4+8x=10x-18 |-4
8x=10x-22 |-10x
-2x=-22 |:-2
x=11