exam Maths Puzzle Numerical Ability

3/7x +2 =4/7x-5
I have tried this over and over again - i keep coming up with -49, but the answer should be 7. I cannot figure it out.
I learned that you should multiply everything by the LCD to make everything a whole number first.

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exam Other Question

Run an Analysis of Variance on the following and conclude if there is a statistical difference between the 3 groups.
A___B___C
13__10__14
16__12__14
14__11__15
16__12__14
how do i do this?


Write the answer in scientific notation

2.00*10(to the 5th power)*5.00*10(to the -3rd power).


explain it please.
:)