(x+7)²-(x-2)²=-15
x²+14x+49-x²-4x+4=-15
10x+53=-15
10x=48
x=4,8
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(x+7)²-(x-2)²=-15
x²+14x+49-x²-4x+4=-15
10x+53=-15
10x=48
x=4,8