exam Maths Puzzle Numerical Ability

This problem seems to hace so mny letteres and numbers that I am loosing myelf in the equation. I am having a hard time just figuring out the LCD.

the equation is x/7x+7 + x+8/1

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exam Other Question
please use a graph
=|1|+2 Media Services charges $40. for a phone and $30/month for its economy plan. Find a model that determines the total cost, C(t), of operating a Media Services phone for t months.