Solve for b
b = -\frac{13}{2} = -6\frac{1}{2} = -6.5
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-2=\frac{9\times 2}{4}+b
Express \frac{9}{4}\times 2 as a single fraction.
-2=\frac{18}{4}+b
Multiply 9 and 2 to get 18.
-2=\frac{9}{2}+b
Reduce the fraction \frac{18}{4} to lowest terms by extracting and canceling out 2.
\frac{9}{2}+b=-2
Swap sides so that all variable terms are on the left hand side.
b=-2-\frac{9}{2}
Subtract \frac{9}{2} from both sides.
b=-\frac{4}{2}-\frac{9}{2}
Convert -2 to fraction -\frac{4}{2}.
b=\frac{-4-9}{2}
Since -\frac{4}{2} and \frac{9}{2} have the same denominator, subtract them by subtracting their numerators.
b=-\frac{13}{2}
Subtract 9 from -4 to get -13.
Examples
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{ x } ^ { 2 } - 4 x - 5 = 0
Trigonometry
4 \sin \theta \cos \theta = 2 \sin \theta
Linear equation
y = 3x + 4
Arithmetic
699 * 533
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}