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x in (-oo:+oo)
(x+64+71+86+90)/5 = 75 // - 75
(x+64+71+86+90)/5-75 = 0
(x+311)/5-75 = 0
(x+311)/5+(-75*5)/5 = 0
x-75*5+311 = 0
x-64 = 0
(x-64)/5 = 0
(x-64)/5 = 0 // * 5
x-64 = 0
x-64 = 0 // + 64
x = 64
x = 64
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