Răspunsuri

2014-08-19T19:13:01+03:00
A) 2x-2+5x-5=7x-7
b) ax-2x+5a-10+ax+x+5a+5=2ax+10a-x-5
c) 6xy+8x-21y-28+4xy-4x-14y+14=10xy-4x-35y-14