Solve for x
x = \frac{161}{18} = 8\frac{17}{18} \approx 8.944444444
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7\times 11.5=9x
Multiply both sides of the equation by 63, the least common multiple of 9,7.
80.5=9x
Multiply 7 and 11.5 to get 80.5.
9x=80.5
Swap sides so that all variable terms are on the left hand side.
x=\frac{80.5}{9}
Divide both sides by 9.
x=\frac{805}{90}
Expand \frac{80.5}{9} by multiplying both numerator and the denominator by 10.
x=\frac{161}{18}
Reduce the fraction \frac{805}{90} to lowest terms by extracting and canceling out 5.
Examples
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{ x } ^ { 2 } - 4 x - 5 = 0
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y = 3x + 4
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Matrix
\left[ \begin{array} { l l } { 2 } & { 3 } \\ { 5 } & { 4 } \end{array} \right] \left[ \begin{array} { l l l } { 2 } & { 0 } & { 3 } \\ { -1 } & { 1 } & { 5 } \end{array} \right]
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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