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4x2+3x-10-7x2-9x=-3x2-6x-9
4x2+3x-7x2-9x+3x2+6x=-9+10
0=1 -sprzeczne
b)w₁+w₃=w₂
4x²+3x-10+(-3x²-6x-9)=-7x²-9x
4x2+3x-10-3x2-6x-9=-7x2-9x
4x2+3x-3x2-6x+7x2+9x=10+9
8x2+6x=19
c)w₃-w₂=w₁
-3x²-6x-9+7x²+9x=4x²+3x-10
-3x2-6x+7x2+9x-4x2-3x=-10+9
0=-1 -sprzeczne
d)w₁-w₃=w₂
4x²+3x-10+3x²+6x+9=-7x²-9x
4x2+3x+3x2+6x+7x2+9x=10-9
14x2+18x=1