book Maths Puzzle Numerical Ability

im having trouble understanding this problem

3(2a + b - 3c)=

can you please explain thank you.

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book Other Question

If the graph of a system of equations is one line, then the system has how many solution(s).

thanks for your help! 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.