Solve for x
x>11
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4\left(2x+3\right)-40>5\left(x+1\right)
Multiply both sides of the equation by 20, the least common multiple of 5,4. Since 20 is positive, the inequality direction remains the same.
8x+12-40>5\left(x+1\right)
Use the distributive property to multiply 4 by 2x+3.
8x-28>5\left(x+1\right)
Subtract 40 from 12 to get -28.
8x-28>5x+5
Use the distributive property to multiply 5 by x+1.
8x-28-5x>5
Subtract 5x from both sides.
3x-28>5
Combine 8x and -5x to get 3x.
3x>5+28
Add 28 to both sides.
3x>33
Add 5 and 28 to get 33.
x>\frac{33}{3}
Divide both sides by 3. Since 3 is positive, the inequality direction remains the same.
x>11
Divide 33 by 3 to get 11.
Examples
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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
\int _ { 0 } ^ { 1 } x e ^ { - x ^ { 2 } } d x
Limits
\lim _{x \rightarrow-3} \frac{x^{2}-9}{x^{2}+2 x-3}