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-x=40B
Variable B cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by B.
40B=-x
Swap sides so that all variable terms are on the left hand side.
\frac{40B}{40}=-\frac{x}{40}
Divide both sides by 40.
B=-\frac{x}{40}
Dividing by 40 undoes the multiplication by 40.
B=-\frac{x}{40}\text{, }B\neq 0
Variable B cannot be equal to 0.
-x=40B
Multiply both sides of the equation by B.
\frac{-x}{-1}=\frac{40B}{-1}
Divide both sides by -1.
x=\frac{40B}{-1}
Dividing by -1 undoes the multiplication by -1.
x=-40B
Divide 40B by -1.