Solve for x
x=\frac{15y}{4}-20
Solve for y
y=\frac{4\left(x+20\right)}{15}
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4x+80-15y=0
Multiply both sides of the equation by 5.
4x-15y=-80
Subtract 80 from both sides. Anything subtracted from zero gives its negation.
4x=-80+15y
Add 15y to both sides.
4x=15y-80
The equation is in standard form.
\frac{4x}{4}=\frac{15y-80}{4}
Divide both sides by 4.
x=\frac{15y-80}{4}
Dividing by 4 undoes the multiplication by 4.
x=\frac{15y}{4}-20
Divide -80+15y by 4.
4x+80-15y=0
Multiply both sides of the equation by 5.
80-15y=-4x
Subtract 4x from both sides. Anything subtracted from zero gives its negation.
-15y=-4x-80
Subtract 80 from both sides.
\frac{-15y}{-15}=\frac{-4x-80}{-15}
Divide both sides by -15.
y=\frac{-4x-80}{-15}
Dividing by -15 undoes the multiplication by -15.
y=\frac{4x}{15}+\frac{16}{3}
Divide -4x-80 by -15.
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\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
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Limits
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