Solve for k
k=-5x
Solve for x
x=-\frac{k}{5}
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-40x-3x\left(-15\right)+k=0
Multiply 4 and -10 to get -40.
-40x-\left(-45x\right)+k=0
Multiply 3 and -15 to get -45.
-40x+45x+k=0
The opposite of -45x is 45x.
5x+k=0
Combine -40x and 45x to get 5x.
k=-5x
Subtract 5x from both sides. Anything subtracted from zero gives its negation.
-40x-3x\left(-15\right)+k=0
Multiply 4 and -10 to get -40.
-40x-\left(-45x\right)+k=0
Multiply 3 and -15 to get -45.
-40x+45x+k=0
The opposite of -45x is 45x.
5x+k=0
Combine -40x and 45x to get 5x.
5x=-k
Subtract k from both sides. Anything subtracted from zero gives its negation.
\frac{5x}{5}=-\frac{k}{5}
Divide both sides by 5.
x=-\frac{k}{5}
Dividing by 5 undoes the multiplication by 5.
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}