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sa se rezolve in multimea Z ecuatia:
a) 3x-9+x=2x-27
b) 5x+13-2x=9x+22-5x


Răspuns :

a) 3x-9+x=2x-27<=>3x-2x+x=9-27<=>2x=-18<=>x= -18: 2<=>x=-9
b) 5x+13-2x=9x+22-5x<=>5x-9x+5x=22-13<=> x=9