Please help me!

Hello, modiej!

Where exactly is your difficulty?
    \displaystyle \;\;You know nothing about simultaneous equations?
    \displaystyle \;\;You don't understand the Elimination/Addition method?
    \displaystyle \;\;You don't understand the Substitution method?
    \displaystyle \;\;You don't know what method to use?
    \displaystyle \;\;Fractions can stop you cold?
    \displaystyle \;\;You really suck at Algebra?

No matter what method I use now, you'll prefer the other method anyway.

How about meeting us halfway with this?
What have you tried?
 
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