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Am nevoie de ajutor cu tema la prega urgent va rog : X-15+3(x+1)=5(x-2)+11

Răspuns :

x-15+3x+3=5x-10+11
4x-12=5x+1
-12-1=5x-4x
-13=x
x=-13

a-15+3a+3=5a-10+11
4a-12=5a+1
-12-1=5a-4a
-13=a
a=-13