Solve for n
n=\frac{D-5}{3}
Solve for D
D=3n+5
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3n+5=D
Swap sides so that all variable terms are on the left hand side.
3n=D-5
Subtract 5 from both sides.
\frac{3n}{3}=\frac{D-5}{3}
Divide both sides by 3.
n=\frac{D-5}{3}
Dividing by 3 undoes the multiplication by 3.
Examples
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Linear equation
y = 3x + 4
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Matrix
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Simultaneous equation
\left. \begin{cases} { 8x+2y = 46 } \\ { 7x+3y = 47 } \end{cases} \right.
Differentiation
\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
Integration
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Limits
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