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

im having trouble understanding this problem

3(2a + b - 3c)=

can you please explain thank you. Is it possible to calculate the height from a given chord to a given arc, given that the only information available is the length of both the chord and the arc, I have been trying to calculate this for some time but it is in vain?