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y\times 2\left(-9B+1\right)=7\times 3\beta -5
Variable B cannot be equal to \frac{1}{9} since division by zero is not defined. Multiply both sides of the equation by 2\left(-9B+1\right).
-18yB+y\times 2=7\times 3\beta -5
Use the distributive property to multiply y\times 2 by -9B+1.
-18yB+y\times 2=21\beta -5
Multiply 7 and 3 to get 21.
-18yB=21\beta -5-y\times 2
Subtract y\times 2 from both sides.
-18yB=21\beta -5-2y
Multiply -1 and 2 to get -2.
\left(-18y\right)B=-2y+21\beta -5
The equation is in standard form.
\frac{\left(-18y\right)B}{-18y}=\frac{-2y+21\beta -5}{-18y}
Divide both sides by -18y.
B=\frac{-2y+21\beta -5}{-18y}
Dividing by -18y undoes the multiplication by -18y.
B=-\frac{-2y+21\beta -5}{18y}
Divide 21\beta -5-2y by -18y.
B=-\frac{-2y+21\beta -5}{18y}\text{, }B\neq \frac{1}{9}
Variable B cannot be equal to \frac{1}{9}.