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(x-3)•(2x-5)-(7-2x)•(3-x)=12x-6

Răspuns :

2x² - 5x - 6x +15 - (21 - 7x - 6x + 2x²)= 12x -6
2x² - 5x - 6x + 15 - 21 +7x + 6x - 2x²= 12x- 6
2x -6 =12x - 6 
-6 +6 =12x -2x 
0=10x
x=0