book Maths Puzzle Numerical Ability

Using my TI 81 calculator how do I type an equals sign?

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solve 4m+12=52
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m=52-12/4
m=40/4
m=10
This question is actually about elimination because there werent any catorgories for elimination. My question is:
3x+4y=19
3x+6y=33

My answer was (7,-1/2) but I don't think th