Odpowiedź :
a) 3(x-2)+4(x-2)=3x-6+4x-8=3x+4x-6-8=7x-14
b) 8(x+4)-5(x+4)=8x+32-5x-20=8x-5x+32-20=3x+12
c) 3(x²-7)+8(x²-7)=3x²-21+8x²-56=3x²+8x²-21-56=11x²-77
d) 7(x-3)-(x-3)=7x-21-x+3=6x-18
e) 4(x+5)+20(x+5)=4x+20+20x+100=24x+120
f) 0,2(-10+x)-(x-10)=-2+0,2x-x+10=-0,8x+8