Solve for k
k=-2
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\frac{1}{5}-2=\frac{12}{5}k-\frac{3}{2}k
Divide 4 by 2 to get 2.
\frac{1}{5}-\frac{10}{5}=\frac{12}{5}k-\frac{3}{2}k
Convert 2 to fraction \frac{10}{5}.
\frac{1-10}{5}=\frac{12}{5}k-\frac{3}{2}k
Since \frac{1}{5} and \frac{10}{5} have the same denominator, subtract them by subtracting their numerators.
-\frac{9}{5}=\frac{12}{5}k-\frac{3}{2}k
Subtract 10 from 1 to get -9.
-\frac{9}{5}=\frac{9}{10}k
Combine \frac{12}{5}k and -\frac{3}{2}k to get \frac{9}{10}k.
\frac{9}{10}k=-\frac{9}{5}
Swap sides so that all variable terms are on the left hand side.
k=-\frac{9}{5}\times \frac{10}{9}
Multiply both sides by \frac{10}{9}, the reciprocal of \frac{9}{10}.
k=\frac{-9\times 10}{5\times 9}
Multiply -\frac{9}{5} times \frac{10}{9} by multiplying numerator times numerator and denominator times denominator.
k=\frac{-90}{45}
Do the multiplications in the fraction \frac{-9\times 10}{5\times 9}.
k=-2
Divide -90 by 45 to get -2.
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}