Solve for a_1
a_{1}=9223372036854775672
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136+1a_{1}=8^{21}
Subtract 5 from 141 to get 136.
136+1a_{1}=9223372036854775808
Calculate 8 to the power of 21 and get 9223372036854775808.
1a_{1}=9223372036854775808-136
Subtract 136 from both sides.
1a_{1}=9223372036854775672
Subtract 136 from 9223372036854775808 to get 9223372036854775672.
a_{1}=9223372036854775672
Reorder the terms.
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