exam Maths Puzzle Numerical Ability

The meteorologists at the National Interagency Fire Center had pizza dilivered to their operations center. Their lunch consisted of pizza, milk, and gelitan. One slice of cheese pi

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What are the steps to solve the following problem

9-2m/7= 19

Is this correct

9-2m/7 = 19
=(9)-9 2m/7 = 19-9
=-2m/7 = 10

I do not know rather this is right or wrong pl what does linear equation- standard form mean?
What does linear equation- slope intercept mean?