Solve for p, q, r
r=6
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p=13
Consider the first equation. Swap sides so that all variable terms are on the left hand side.
q=6
Consider the second equation. Multiply 0.5 and 12 to get 6.
r=6
Consider the third equation. Insert the known values of variables into the equation.
p=13 q=6 r=6
The system is now solved.
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