Solve for x
x = -\frac{13}{7} = -1\frac{6}{7} \approx -1.857142857
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-x=4-\frac{15}{7}
Subtract \frac{15}{7} from both sides.
-x=\frac{28}{7}-\frac{15}{7}
Convert 4 to fraction \frac{28}{7}.
-x=\frac{28-15}{7}
Since \frac{28}{7} and \frac{15}{7} have the same denominator, subtract them by subtracting their numerators.
-x=\frac{13}{7}
Subtract 15 from 28 to get 13.
x=-\frac{13}{7}
Multiply both sides by -1.
Examples
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{ x } ^ { 2 } - 4 x - 5 = 0
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4 \sin \theta \cos \theta = 2 \sin \theta
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
\int _ { 0 } ^ { 1 } x e ^ { - x ^ { 2 } } d x
Limits
\lim _{x \rightarrow-3} \frac{x^{2}-9}{x^{2}+2 x-3}