exam Maths Puzzle Numerical Ability

Pleasehelp solve, I have forgotten how this isdone...

|8-7+2-4|-|3-6+2|

Thank you for your help.

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exam Other Question

1/3x-2=7 I have two sets of points; (42,20) and (52,10). I need an equation in the form of y = mx + b. The answer I got was y = 1x - 22. Is this correct?