Solve for x
x=20
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\frac{5}{2}=\frac{x}{8}
Multiply 4 and 2 to get 8.
\frac{x}{8}=\frac{5}{2}
Swap sides so that all variable terms are on the left hand side.
x=\frac{5}{2}\times 8
Multiply both sides by 8.
x=\frac{5\times 8}{2}
Express \frac{5}{2}\times 8 as a single fraction.
x=\frac{40}{2}
Multiply 5 and 8 to get 40.
x=20
Divide 40 by 2 to get 20.
Examples
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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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