book Maths Puzzle Numerical Ability

I am a high school student who is having problems with equations and no matter how hard I try I cannot solve this equation.
3x-4=2x+8
can you help me please.

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book Other Question

how do you write x+2=1/5y in standard form hey can you help me on these three questions they are
1. 10-3+(2+5)=?
2. 7+18-(6-3)=?
3.[(7*4)+3]+15=?