T=(t 17+t 26+t 35+t 44+t 53+t 62+t 7*1)/(7+6+5+4+3+2+1)

Type your math problem... T=(T-1*7+T-2*6+T-3*5+T-4*4+T-5*3+T-6*2+T-7*1)/(7+6+5+4+3+2+1)

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T=(t 1*7+t 2*6+t 3*5+t 4*4+t 5*3+t 6*2+t 7*1)/(7+6+5+4+3+2+1)