Odpowiedź :
a) 2x+8-7x+12= -5x+20
b) 11x+6+7x-5= 18x+1
c) 18a2-36a-8a2+14= 10a2-36a+14
d) 35a2+25a-21a-15= 35a2+4a-15
e) 6x+12
b) 11x+6+7x-5= 18x+1
c) 18a2-36a-8a2+14= 10a2-36a+14
d) 35a2+25a-21a-15= 35a2+4a-15
e) 6x+12