Răspuns:
a) 2x+2= -7x-21 +9x-15-5 7x+2x- 9x = -21-20-2 0= -43 imp
b) -9x-3 +14 = 21x-9-10 21x+9x = 14-3+10+9
30x= 24+6 30x= 30 x= 30 :30=1 x=1
c) 14+2*(3-2x+6):2= 37 2*(3-2x+6):2= 37-14 = 23
(6-4x+12):2=23 6+12-4x= 2*23 18-4x=46
4x=18-46 4x=-28 x= (-28):4 = -7 x= -7
d) -4 -[ 6- (-3-3 -5-x- 7)- 9]= 1
-4-1 = [ 6- (-3-3 -5-x- 7)- 9] -5 = [ 6- (-6 -12-x) -]
6- (-18 -x) -9 = -5 6+18 +x -9= -5 24 +x= 4 x= 4-24
x= -20
