Solve for x
x<4
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21+x>5x+5
Multiply both sides of the equation by 5. Since 5 is positive, the inequality direction remains the same.
21+x-5x>5
Subtract 5x from both sides.
21-4x>5
Combine x and -5x to get -4x.
-4x>5-21
Subtract 21 from both sides.
-4x>-16
Subtract 21 from 5 to get -16.
x<\frac{-16}{-4}
Divide both sides by -4. Since -4 is negative, the inequality direction is changed.
x<4
Divide -16 by -4 to get 4.
Examples
Quadratic equation
{ x } ^ { 2 } - 4 x - 5 = 0
Trigonometry
4 \sin \theta \cos \theta = 2 \sin \theta
Linear equation
y = 3x + 4
Arithmetic
699 * 533
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
\lim _{x \rightarrow-3} \frac{x^{2}-9}{x^{2}+2 x-3}