book Maths Puzzle Numerical Ability

Multiply

(x/3 + 3/4) (3x/4 - 3/5)

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book Other Question

please help with this equation.

4(x+1)=2(x-3)-(1-2x) Could you please help me with this equation?
x+2y=5
3x-15+-6y
It has to be solved using elimination or substitution.
I need serious help!!!!