prima coloană:
a) x=6 b) x=7•10/5=14 c) x-1=6•4/3=8 => x=9
d) x+2=4x-10 => 3x=12 => x=4
a 2a coloană:
a)x=8•5/2=20 b)0,3x=60 => x=200
c)10x+70=21x-7 => 11x=77 => x=7
d) 7( x0 +x1+x2) = 11• 2x
7( x0+x0 +1 +x0+2) =11• 2x
7•3• x0 + 21= 11• (20+ x)
21• 10•x +21 = 220+ 11x
210x +21 = 220 + 11x
199x = 199
=> x=1
