Follow PEMDAS (Parenthesis, Exponents, Multiplication, Division, Addition, Subtraction), but do what is in the brackets first.
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2nd [CATALOG], solve( , enter equation, variable and guess after the bracket, close brackets with " ) ". You can also put lower and upper bounds after the guess.
Tell me the equations first.
You need as many equations as you have variables.
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You can solve the system of equations with three variables using the substitute method, or using matrix operations.