exam Maths Puzzle Numerical Ability

I am having a problem working this equation: 1/2 - 3m /4+7 + 4m - 9m /28.
I added 3m to both sides and come up with 1/2 / 11 = -5m / 28. Am I on the right track?

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exam Other Question

Use the slope-intercept form of the linear equation to write an equation of the line with given slope and y-intercept.

Slope -2/5; y-intercept (0,4)
18/48 = 12/n