Mnożenie sum algebraicznych
(x+2)(x-1)=x^2 +5
^2 - Do drugiej
x²-x+2x-2=x²+5
x²+x-x²=5+2
x=7
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(x+2)(x-1)=x^2 +5
x²-x+2x-2=x²+5
x²+x-x²=5+2
x=7