Solve for x
x = \frac{13}{7} = 1\frac{6}{7} \approx 1.857142857
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9-7x+4=0
Calculate 3 to the power of 2 and get 9.
13-7x=0
Add 9 and 4 to get 13.
-7x=-13
Subtract 13 from both sides. Anything subtracted from zero gives its negation.
x=\frac{-13}{-7}
Divide both sides by -7.
x=\frac{13}{7}
Fraction \frac{-13}{-7} can be simplified to \frac{13}{7} by removing the negative sign from both the numerator and the denominator.
Examples
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Linear equation
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
\int _ { 0 } ^ { 1 } x e ^ { - x ^ { 2 } } d x
Limits
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