a) 3x+1=x+7 2x=6 x=3
b) 3x + 7= 2x - 3 x=-10
c) -1+ 8x =6x - 9 2x=-8 x=-4
d) 4x - 3 =7x - 6 3x=3 x=1
e) 5x - 7 =-3x - 23 8x=-16 x=-2
f) -2x + 3 = - 3x + 1 x=-2
g) 9 - 7x = 5 - 4x 3x=4 x=4/3 nu are solutie in Z
h)-3 + 5x =-11 + 3x 2x=-8 x=-4
i) 6x + 5x-1= 3 + 11x -1=3 nu are solutie
j) -7 - 5x = 6x - 7 11x=0 x=0
k)-(-2)² + 3x -1-x=2x-5
-4 + 2x -1-x=2x-5
-5=-5 egalitatea nu depinde de x, x poate lua orice valoare din Z