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d in (-oo:+oo)
4*(7*d-1) = -284 // + 284
4*(7*d-1)+284 = 0
4*(7*d-1)+284 = 0
28*d+280 = 0
28*d+280 = 0
28*d+280 = 0 // - 280
28*d = -280 // : 28
d = -280/28
d = -10
d = -10
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