Solve for a
a=x-85
Solve for x
x=a+85
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85-x=-a
Subtract 5 from 90 to get 85.
-a=85-x
Swap sides so that all variable terms are on the left hand side.
\frac{-a}{-1}=\frac{85-x}{-1}
Divide both sides by -1.
a=\frac{85-x}{-1}
Dividing by -1 undoes the multiplication by -1.
a=x-85
Divide 85-x by -1.
85-x=-a
Subtract 5 from 90 to get 85.
-x=-a-85
Subtract 85 from both sides.
\frac{-x}{-1}=\frac{-a-85}{-1}
Divide both sides by -1.
x=\frac{-a-85}{-1}
Dividing by -1 undoes the multiplication by -1.
x=a+85
Divide -a-85 by -1.
Examples
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{ x } ^ { 2 } - 4 x - 5 = 0
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4 \sin \theta \cos \theta = 2 \sin \theta
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y = 3x + 4
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Matrix
\left[ \begin{array} { l l } { 2 } & { 3 } \\ { 5 } & { 4 } \end{array} \right] \left[ \begin{array} { l l l } { 2 } & { 0 } & { 3 } \\ { -1 } & { 1 } & { 5 } \end{array} \right]
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
\lim _{x \rightarrow-3} \frac{x^{2}-9}{x^{2}+2 x-3}