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b)-ab+b do kwadratu +3ab-2ab = b do kwadratu
c)2/3x+1/3y +2 i 1/3x - 1/3y =3x
d) 15xy - 4x +8y-6xy+5x-xy = 8xy+x+8y
e) 0,2x do kwadratu -2y +1,8x do kwadratu +4,3y-x = 2x²+2,3y-x+1
f)-1/4m+1/8n-1/8m+0,375m = 1/8n