Solve for z
z=\frac{1}{4}=0.25
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z≔\frac{1}{4}
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z=\frac{15}{4}-\frac{5\times 7}{2\times 5}
Multiply \frac{5}{2} times \frac{7}{5} by multiplying numerator times numerator and denominator times denominator.
z=\frac{15}{4}-\frac{7}{2}
Cancel out 5 in both numerator and denominator.
z=\frac{15}{4}-\frac{14}{4}
Least common multiple of 4 and 2 is 4. Convert \frac{15}{4} and \frac{7}{2} to fractions with denominator 4.
z=\frac{15-14}{4}
Since \frac{15}{4} and \frac{14}{4} have the same denominator, subtract them by subtracting their numerators.
z=\frac{1}{4}
Subtract 14 from 15 to get 1.
Examples
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{ x } ^ { 2 } - 4 x - 5 = 0
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4 \sin \theta \cos \theta = 2 \sin \theta
Linear equation
y = 3x + 4
Arithmetic
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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}