Solve for x
x=\frac{4}{5}=0.8
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2\times \frac{2}{5}=x
Multiply both sides by \frac{2}{5}, the reciprocal of \frac{5}{2}.
\frac{2\times 2}{5}=x
Express 2\times \frac{2}{5} as a single fraction.
\frac{4}{5}=x
Multiply 2 and 2 to get 4.
x=\frac{4}{5}
Swap sides so that all variable terms are on the left hand side.
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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