book Maths Puzzle Numerical Ability

Could you please help me with this equation?
x+2y=5
3x-15+-6y
It has to be solved using elimination or substitution.
I need serious help!!!!

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book Other Question

Multiply

(x/3 + 3/4) (3x/4 - 3/5)
A store has all board games on sale for 25% off the regular price. A checker set has a sale price of $12. It is then moved ot a clearance table where every item is discounted 40%