Solve for x
x>7
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-8+7x>20+3x
Add 7 and 13 to get 20.
-8+7x-3x>20
Subtract 3x from both sides.
-8+4x>20
Combine 7x and -3x to get 4x.
4x>20+8
Add 8 to both sides.
4x>28
Add 20 and 8 to get 28.
x>\frac{28}{4}
Divide both sides by 4. Since 4 is positive, the inequality direction remains the same.
x>7
Divide 28 by 4 to get 7.
Examples
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Linear equation
y = 3x + 4
Arithmetic
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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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