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2x-x^2+2x+x^2=x+18
4x-x=18
x=6
2
tu obustronnie razy 4
2x+6-x-4=8
x=6
3
12-6x-20+4x=-x-3
-2x+x=20-12-3
-x=5
x=-5
2x-x²+2x+x²=18+x
2x+2x-x=18
3x=18
x=6
2(x+3) - x+4 =8
2x+6-(x+4)=8
x=6
12-6x-20+4x=-x-3
-6x+x+4x=-3-12+20
-x=5 /*(-1)
x=-5