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2x+4-3x+3+8=3x-1
2x-3x-3x=-1-4-3-8
-4x=-16
x=4
b)4x-3(x+7)-5x+2(x-1)=9
4x-3x-21-5x+2x-2=9
4x-3x-5x+2x=21+2+9
-2x=32
x=-16
c)nie wiem
d)5x(x-2)-x(5x-2)=-4
5xkwadrat-10x-5xkwadrat+2x=-4
-10x+2x=-4
-8x=-4
x=1/2
e)x(2-x)+(x+2)(x-2)=2
2x-xkwadrat+xkwartat-2x+2x-4=2
2x=2+4
2x=6
x=3
f)(2x-3)(2x+3)-4x(x+2)+49=-4x
4xkwadrat+6x-6x-9-4xkwadrat-8x+49=-4x
-8x+4x=9-49
-4x=-40
x=10