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a)2x-3=3
2x=3+3
2x=6/:2
x=3
b)8x dodać 7=4x dodać 3
8x+7=4x+3
8x-4x=3-7
4x=-4/:4
x= -1
c)3(1-x)=0
3-3x=0
-3x=0-3
-3x= -3/: (-3)
x=1
2.
a)2x-1=1
2x=1+1
2x=2/:2
x=1
spełnia
b) 3x+2=2x+4
3x-2x=4-2
x=2
nie spełnia