Solve for b
b=\frac{x-15}{2}
Solve for x
x=2b+15
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x-2b=15
Swap sides so that all variable terms are on the left hand side.
-2b=15-x
Subtract x from both sides.
\frac{-2b}{-2}=\frac{15-x}{-2}
Divide both sides by -2.
b=\frac{15-x}{-2}
Dividing by -2 undoes the multiplication by -2.
b=\frac{x-15}{2}
Divide 15-x by -2.
x-2b=15
Swap sides so that all variable terms are on the left hand side.
x=15+2b
Add 2b to both sides.
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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