book Maths Puzzle Numerical Ability

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=?

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book Other Question

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.
find mising no

3,10,7,_,8_,2,9