Solve for x
x=-\frac{5}{21}\approx -0.238095238
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4-20x-x=9
Use the distributive property to multiply 4 by 1-5x.
4-21x=9
Combine -20x and -x to get -21x.
-21x=9-4
Subtract 4 from both sides.
-21x=5
Subtract 4 from 9 to get 5.
x=\frac{5}{-21}
Divide both sides by -21.
x=-\frac{5}{21}
Fraction \frac{5}{-21} can be rewritten as -\frac{5}{21} by extracting the negative sign.
Examples
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{ x } ^ { 2 } - 4 x - 5 = 0
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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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