Răspuns:
a)2(-x+1)=-6
-2x+2=-6
2x=8. x=4=>(3)
b)l2x-6l=0 2x-6≥0=>2x-6=0 x=3 (1)
2x-6<0 -2x+6=0 x=3
c)3/(x+1) €Z. x+1=±1;=±3;
x=0 x=-2. x=2. x=-4
suma 0-2+2-4=-4 (2)
d)3^x=2017^x
2017nu e divizibil cu 3
=>x=0. (4)
