book Maths Puzzle Numerical Ability

2x + 3y = 31
y = x + 7

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book Other Question

I'm having a hard time on this one. Can someone please help me solve it?

3^4x+5 = 9
That is 3 raised to the power 4x + 5 equals 9 - Solve for X

Thank you I would please like your help with this problem: 5x-3(2x-1)=5-3(-x+2)