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x in (-oo:+oo)
5*(7*x-5) = 255 // - 255
5*(7*x-5)-255 = 0
5*(7*x-5)-255 = 0
35*x-280 = 0
35*x-280 = 0
35*x-280 = 0 // + 280
35*x = 280 // : 35
x = 280/35
x = 8
x = 8
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