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6(x+3)=2x-15,xPARTINE Z
2-5x=12
sunt 2 exercitii !


Răspuns :

6x+18=2x-15
6x-2x=-15-18
4x=33
x=33:4 apartine Z

2-5x=12
-5x=12-2
x=10:(-5)
x=-2 
6x+18=2x-15
6x-2x=-18-15
4x=-33
x=-33/4

2-5x=12
2-12=5x
-10=5x
x=-10/5
x=-2