Command Solve Equation 
- an equation LHS is equal to R4 RHS is a fraction: the top of the fraction is a product that contains 2 factors; the first factor of the product is equal to R2; the second factor of the product is equal to R3; the bottom of the fraction is R1;
- R4 is R2 times R3 divided by R1;
VariableResultExact  
- an equation Left side of the equation is equal to R3 Right side of the equation is a fraction: the top of the fraction is a product that consists of 2 factors; the first factor of the product is equal to R1; the second factor of the product is R4; the bottom of the fraction is R2;
- R3 is equal to R1 times R4 over R2.
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