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4x=-12
x=-3
2) x- (5-2x)= 6- (1- 3x)
x-5+2x=6-1+3x
3x-5=3x+5
-5=5
sprzeczne
3)2(x+1)-3 (2x+1)= 2x+1
2x+2-6x-3=2x+1
-4x-1=2x+1
-6x=2
x=-⅓