exam Maths Puzzle Numerical Ability

This is a word problem. One number is 12 more than another. The sum of the smaller number and twice the larger number is 39. Find the larger number.
I do not even know where to begin on this problem. Please Help!!!!!

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exam Other Question

If the lines passing through the points (1,a) and (4,-2) is parallel to the line passing through the points (2,8) and (-7,a+4), what is the value of a? Can someone out please help a highly distressed individual as myself and graph
x>2
This problem seems to elude me and even my best friend who is a wiz in math and graphs. Can someone show us what we are doing wrong?