Solve for x
x=-4
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8x-2x-1=3x-13
To find the opposite of 2x+1, find the opposite of each term.
6x-1=3x-13
Combine 8x and -2x to get 6x.
6x-1-3x=-13
Subtract 3x from both sides.
3x-1=-13
Combine 6x and -3x to get 3x.
3x=-13+1
Add 1 to both sides.
3x=-12
Add -13 and 1 to get -12.
x=\frac{-12}{3}
Divide both sides by 3.
x=-4
Divide -12 by 3 to get -4.
Examples
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4 \sin \theta \cos \theta = 2 \sin \theta
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
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Limits
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