Solve for x
x=-2
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8x+3+4x=-21
Add 4x to both sides.
12x+3=-21
Combine 8x and 4x to get 12x.
12x=-21-3
Subtract 3 from both sides.
12x=-24
Subtract 3 from -21 to get -24.
x=\frac{-24}{12}
Divide both sides by 12.
x=-2
Divide -24 by 12 to get -2.
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
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Limits
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