Solve for d, q, f
f=e\approx 2.718281828
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d=-q+7
Solve d+q=7 for d.
e=0.1\left(-q+7\right)
Substitute -q+7 for d in the equation e=0.1d.
q=-10e+7
Solve e=0.1\left(-q+7\right) for q.
d=-\left(-10e+7\right)+7
Substitute -10e+7 for q in the equation d=-q+7.
d=10e
Calculate d from d=-\left(-10e+7\right)+7.
d=10e q=-10e+7 f=e
The system is now solved.
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