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aflati x 7x + 3= 3x + 2 ( 2x + 3)

Răspuns :

7X+3=3X+2(2X+3)
7x+3=3x+4x+6
7x+3=7x+6
x=3
7x+3=3x+4x+6
7x+3=7x+6
7x-7x=6-3
x=3