Rozwiąż równanie : (x+3)(x-1)=x²-7
x²-x+3x-3=x²-7x²-x+3x-x²=3-72x=-4/:2x=-2
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x²-x+3x-3=x²-7
x²-x+3x-x²=3-7
2x=-4/:2
x=-2