Solve for x
x=-2
Graph
Share
Copied to clipboard
-3.9x-12.8+11.4x=-1-26.8
Combine 3.6x and -7.5x to get -3.9x.
7.5x-12.8=-1-26.8
Combine -3.9x and 11.4x to get 7.5x.
7.5x-12.8=-27.8
Subtract 26.8 from -1 to get -27.8.
7.5x=-27.8+12.8
Add 12.8 to both sides.
7.5x=-15
Add -27.8 and 12.8 to get -15.
x=\frac{-15}{7.5}
Divide both sides by 7.5.
x=\frac{-150}{75}
Expand \frac{-15}{7.5} by multiplying both numerator and the denominator by 10.
x=-2
Divide -150 by 75 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}