Solve for x
x = -\frac{31}{8} = -3\frac{7}{8} = -3.875
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1-8x-12-5=15
Use the distributive property to multiply -4 by 2x+3.
-11-8x-5=15
Subtract 12 from 1 to get -11.
-16-8x=15
Subtract 5 from -11 to get -16.
-8x=15+16
Add 16 to both sides.
-8x=31
Add 15 and 16 to get 31.
x=\frac{31}{-8}
Divide both sides by -8.
x=-\frac{31}{8}
Fraction \frac{31}{-8} can be rewritten as -\frac{31}{8} by extracting the negative sign.
Examples
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Linear equation
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
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