Solve for x
x=5
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5x-8x+28=13
Use the distributive property to multiply -4 by 2x-7.
-3x+28=13
Combine 5x and -8x to get -3x.
-3x=13-28
Subtract 28 from both sides.
-3x=-15
Subtract 28 from 13 to get -15.
x=\frac{-15}{-3}
Divide both sides by -3.
x=5
Divide -15 by -3 to get 5.
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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