Not generally, but in this case there is a slightly simpler way if you note that 630 = 45*14
Then 1/630 - 1/45 = 1/(45*14) - 1/45 = 1/45*(1/14 - 1) = 1/45*(-13/14)
= -13/(45*14) = -13/630
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"Dividing Fractions is easy as pie, flip the second and multiply." Flip the second fraction, and multiply, and reduce.
Divide them, 10/2 = 5 ,12/2= 6, there's one, 5 over 6. easy.
Fractions aren't really difficult, once you understand them. Mainly, you have to memorize when to use which operation, so that you don't get adding and multiplying fractions confused, for example.
Same as for addition. Mainly, you have to convert the fractions to equivalent fractions that have the same denominator. After that, it is easy: just subtract the numerators and put the result on top of the common denominator.
You can eliminate the fractions before proceeding to solve the equation to allow for easy factorization.