exam Maths Puzzle Numerical Ability

I am thinking of a number. If you multily my number by 2 and then add 3, you will get 55. What is my number?

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PLEASE !!!!!!!!!!!HELP !!!!!!!!!!!!!!!1

If a+b+c+d=45 and a+2=b-2=2c=d/2
FIND the values of a b c d PLEASEEEEEEEEEEEEEEEEE !!!!!!!!!! GOD BLESS YOU !!!!!!! Find the slope of the line.

The graph shows y= (0,8)
x= (3,-7)

The slope of the line is m= -5