The coefficients can be any numerical constants.
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The method is the same.
Any variable divided by coefficients can equal 7 - provided the variable can take the appropriate value.
Just multiply the coefficients, leave the variable the same, and add the exponents.
The answer depends on what are meant to be real numbers! If all the coefficients are real and the matrix of coefficients is non-singular, then the value of each variable is real.
When an equation has a variable in it (only one), then there are only certainvalues the variable can have that will make the equation a true statement."Solving" the equation means finding those values for the variable.