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.
The expression (3t \times 3t) can be simplified by multiplying the coefficients and the variable separately. First, multiply the coefficients: (3 \times 3 = 9). Then, multiply the variable (t) by itself: (t \times t = t^2). Therefore, the result is (9t^2).