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3 5
x=4-1
x=3
2) 7 = 3- sprzeczne
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3x-1= 4+2x
3x-2x=5
x=5
3) x + 3 (1-x)=4
x+3-3x=4
-2x=1
x=-1/2
4) x+3 + 1 = 3x
x-3x=-1-3
-2x=-4
x=2
5) x+1 = x
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2 3
1=0 sprzeczne