(√x²+8x+7)²=(2+x)²
x²+8x+7=4+x²
x²+8x+7-4-x²=0
8x+3=0
8x=-3
x=-3÷4
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(√x²+8x+7)²=(2+x)²
x²+8x+7=4+x²
x²+8x+7-4-x²=0
8x+3=0
8x=-3
x=-3÷4