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OpenStudy (anonymous):
12h+n=200 9h+2n/3=155 solve the linear system for n
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OpenStudy (anonymous):
Solve one equation or the other for a variable (the first would be easiest to solve for n. Then plug that in. So you can easily solve 12h+n = 200 to n = 200 - 12h by subtracting 12h from both sides. Then put that into the second equation and solve.
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