book Maths Puzzle Numerical Ability

6x+5x=3x+2x-54

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book Other Question

Can you help?

(x+1)(3x-4)-(x-1) Simplify

I got x^2+3x-4, is this right?
Use linear Combinations to solve the system of linear equations.

x+1-3y=0
2x=7-3y

Im having so much trouble solving these types of Problems ! Please help!!! Show me how