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-4.05=-40.5x
Variable x cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by x.
-40.5x=-4.05
Swap sides so that all variable terms are on the left hand side.
x=\frac{-4.05}{-40.5}
Divide both sides by -40.5.
x=\frac{-405}{-4050}
Expand \frac{-4.05}{-40.5} by multiplying both numerator and the denominator by 100.
x=\frac{1}{10}
Reduce the fraction \frac{-405}{-4050} to lowest terms by extracting and canceling out -405.