oblicz:
a) 2(x-6)=4x-(x-8)
b) 4x-(9-x)=x+7
c)2x-2(3x-4)=8-(2x-4)
d) 3-[x-(3-x)]=x-(4x-2)
a)
2(x-6)=4x-(x-8)
2x-12=4x-x+8
2x-3x=8+12
-x=20
x=-20
b)
4x-(9-x)=x+7
4x-9+x=x+7
5x-x=7+9
4x=16
x=4
c)
2x-2(3x-4)=8-(2x-4)
2x-6x+8=8-2x+4
-4x+2x=12-8
-2x=4
x=-2
d)
3-[x-(3-x)]=x-(4x-2)
3-(x-3+x)=x-4x+2
3-x+3-x=-3x+2
-2x+3x=2-6
x=-4
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a)
2(x-6)=4x-(x-8)
2x-12=4x-x+8
2x-3x=8+12
-x=20
x=-20
b)
4x-(9-x)=x+7
4x-9+x=x+7
5x-x=7+9
4x=16
x=4
c)
2x-2(3x-4)=8-(2x-4)
2x-6x+8=8-2x+4
-4x+2x=12-8
-2x=4
x=-2
d)
3-[x-(3-x)]=x-(4x-2)
3-(x-3+x)=x-4x+2
3-x+3-x=-3x+2
-2x+3x=2-6
x=-4