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-15x²+20xy+25x+6xy-9y²+18y-18y-25x=
-15x²-9y²+26xy
6x(2x+4y+3)-2y(3x-6y-8) =
12x²+24xy+18x-6xy+12y²+16y=
12x²+12y²+18xy+18x+16y
3,5(5a-3b))-(-7a+5b)=
17,5a-10,5b-7a-5b=
10,5a-15,5b
-15x²+20xy+25x+6xy-9y²+18y-18y-25x=
-15x²-9y²+26xy
6x(2x+4y+3)-2y(3x-6y-8) =
12x²+24xy+18x-6xy+12y²+16y=
12x²+12y²+18x+16y+18xy
3,5(5a-3b)-(-7a+5b)=
17,5a-10,5b+7a-5b=
10,5a-15,5b