book Maths Puzzle Numerical Ability

How do I simplify this problem

3a + b/6a + 2b

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book Other Question

determine an ordered pair solution that satissfies the following linear equations
2x-5=7y+3x
Find an equation of a line expressed in slope intercept form of the equation of a line for the following: (Can you give me an explaination as well)

slope = 3 passing through (