exam Maths Puzzle Numerical Ability

Simplify and evaluate:
(2(2)x5y-3z(4)/4(0)x-2y-8z(5))3

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exam Other Question

Can someone help me on this problem?

I need to solve the following equation for x, and show proof.

3x - 5(3x -7) = 2(x+9) + 45

Thanks,
Sher please help me I don't understand 79+v225-23=