grupezi termenii cu necunoscute si termenii liberi (termenii asemenea)
a) 35x^2-9-9=35x^2-18
b) 4x^2-4x^2 -2V5 = -2V5
c) -4x+4x+3V2+5V2=8V2
d) -23a^2+17a^2+5V2-2V2-3V2= - 6a^2
e) -3x^2+x^2+6x^2+ax+5ax+12-7+9=-2x^2+6ax+14
f) 4x^2+a+3a-5a+7a+x-6x=4x^2+6a-5x
g) a^2b-a^2b-3b^2+8b^2+10b^2+100+49=15b^2+149
