Solve for r
r=5
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3r=19-4
Subtract 4 from both sides.
3r=15
Subtract 4 from 19 to get 15.
r=\frac{15}{3}
Divide both sides by 3.
r=5
Divide 15 by 3 to get 5.
Examples
Quadratic equation
{ x } ^ { 2 } - 4 x - 5 = 0
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4 \sin \theta \cos \theta = 2 \sin \theta
Linear equation
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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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