Solve for a
a=5
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5a-4=7\times 3
Multiply both sides by 3.
5a-4=21
Multiply 7 and 3 to get 21.
5a=21+4
Add 4 to both sides.
5a=25
Add 21 and 4 to get 25.
a=\frac{25}{5}
Divide both sides by 5.
a=5
Divide 25 by 5 to get 5.
Examples
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{ x } ^ { 2 } - 4 x - 5 = 0
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4 \sin \theta \cos \theta = 2 \sin \theta
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
\int _ { 0 } ^ { 1 } x e ^ { - x ^ { 2 } } d x
Limits
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