exam Maths Puzzle Numerical Ability

if 6x-7=29, then6x=36

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exam Other Question

-20 - (-1)
____________
-3 - (-3)
Help please, I believe this is Undefined but want to double check! Thanks so much for your help. Can someone help me on this?

I need to translate the following statement into an algebraic equation. Let x represent the number:

7 more than a number is 19

Thanks, Lyn