exam Maths Puzzle Numerical Ability

I need help solving:

Solve the system by addition or substitution.
3x + 6y = 0
x=2/3

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exam Other Question

in a class of 68 students, there are 8 fewer democrats than republicans, and there are only half as many independents as democrats if every student is registered as a democrat, republican, or independent, how many students are in each group? 1/3 divided by2/5 =6/x can you help me solve it?