Help.

x = 1

Step-by-step explanation:

( 6^2 + 1 ) 6^x = ( 36 + 1 ) x " multiply by "  6^x = 222

so 37 x 6^x = 222

divide by 37

6^x = 6^1

so

x = 1

^ this symbol is for the power

a_n = a_1 + (n - 1)d

the first term is 6.

the common difference d = ?

when you find d, replace n with 7 and d with the common difference to find your answer.