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Efectuati
-12(3-x)=7-20x
x(6-x)+x^2-12=-x
x/6+1/2=(6(x-2))/2
Dau coroana!!!!!!!!!!
DAU COROANA!!


Răspuns :

-36+12x = 7-20x
32x=43
x= 43/32

6x-x^2+x^2-12=-x
7x=12
x=12/7

x/6 +1/2 = (6x-12)/2 | •2
x/3 + 1 = 6x-12
x/3 -6x = -13 | •3
x -18x = -39
-17x = -39
x=39/17