exam Maths Puzzle Numerical Ability

Can you explain to me about finding the LCD on Solving Equations Involving Rational Expressions.
((((8/7+2x + x+3/2x+7)))
(((3/x-5=3/3x-2)))

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exam Other Question

Hello, I need help with some domain problems,the first problem is,solve y= -2x+7 if the domain is {-2,0,4,7}.The next one is,find the domain of x minus 2y=1 if the range is {-2,0,5 Solve each of the systems by adding. If a unique solution does not exist, state whether the system is inconsistent or dependent.
2x + 3y = 1
5x + 3y = 16

I am having a hard time with these and need a little help.