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b in (-oo:+oo)
7*(4*b+4) = -252 // + 252
7*(4*b+4)+252 = 0
7*(4*b+4)+252 = 0
28*b+280 = 0
28*b+280 = 0
28*b+280 = 0 // - 280
28*b = -280 // : 28
b = -280/28
b = -10
b = -10
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