exam Maths Puzzle Numerical Ability

Solve the equation:

3(x-0.87) -2x = 4.98

What I got:

3x-2.61-2x = 4.98
1x-2.61 = 4.98
1x-2.61+2.61 = 4.98+2.61
1x = 7.59
1x/1 = 7.59/1
x = 7.59

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exam Other Question

Not sure if I did this right...

√-3 - √-75

I came up with √3i - 5√3i

Thanks!
how do you do partial fraction decomposition?? Like on a problem such as: 1/(x^2+x)???