exam Maths Puzzle Numerical Ability

x/2+x/4=5

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exam Other Question

Round your anseer to two dedecimal places. 5.6x-1.2=1x+26.4 I need to know how to create a set of linear equations which go through the point (1,2). I can get a ghetto answer by graphing the point and creating some lines, but I want to know how to do the problem right.
thanks