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    how do I solve an equation that involves fractions on both sides, each of which having very different denominators? e.g. 7n-100/n+220 = 15/69 (this is the current question I'm stuck on but I've never been able to do these kinds of things.) any help will be really appreciated
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    I'd cross multiply.

    So 7n-100/n+220 = 15/69 becomes:
    69(7n-100) = 15(n+220)
    Then expand and solve as a normal linear equation.
 
 
 
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