book Maths Puzzle Numerical Ability

9+Y=8-X

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My questions says write the equation of a line that has a slope of 2/3 and passes through point (6,-3)
my answer is y=4-7=-3
is that right?
could you help me with this equations, im stuck!!!

3x-5=2x

could you show me how i can solve this equation.
please!!!
Thanks