exam Maths Puzzle Numerical Ability

How would I solve this by substitution
6x-3y=6
y=2x+5

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exam Other Question

one number is 12 more than another the sum of the smaller number and twice the larger number is 39 find the larger number let x be the larger number and y be the smaller number Solve the equation for x:
x^2+4x+4=7
I am not sure where to start with this one. It is strange because of the extra number. How do I do this problem? PLEASE HELP! THANK YOU!
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