Equations that have letters are just called equations, but there are types 1, 2, 3, 4 and ratio type equations. Ratio type equations are the ones where it is a fraction on both sides of the equals sign.
Equation (Type 2): x+1-5=12
Ratio Type Equation: 21/7=42-x/3
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By eliminating the fractions
You cannot solve fractions. There may be sums or products containing fractions or equations that can be solved. But fractions themselves cannot.
Assuming you want to get rid of the fractions, you can multiply both sides of the equations by the greatest common factor of the fractions. Then you can solve the equation normally.
use proportions
it often simplifies arithmetic