x²+x=(x+1)²-7(x+2)
x²+x=x²+2x+1-7x-14
x²+x=x²-5x-13
x²-x²+x+5x=-13
6x=-13/:6
x=-13/6
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x²+x=(x+1)²-7(x+2)
x²+x=x²+2x+1-7x-14
x²+x=x²-5x-13
x²-x²+x+5x=-13
6x=-13/:6
x=-13/6