exam Maths Puzzle Numerical Ability

how to slove 2.1x + 45.2 = 3.2 - 8.4x

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PLEASE HELP ME
The sum of the geometric series 42-7+(7/6)...+42(-1/6)^9 is approzimately
a. 34.833333
b. -0.857
c. 35.9999994
d. -35.99999643
THANK YOU What is the coefficient of 6/x^2 and the variable part?