Solve for M
M=100
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40=0.4M
Variable M cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by M.
0.4M=40
Swap sides so that all variable terms are on the left hand side.
M=\frac{40}{0.4}
Divide both sides by 0.4.
M=\frac{400}{4}
Expand \frac{40}{0.4} by multiplying both numerator and the denominator by 10.
M=100
Divide 400 by 4 to get 100.
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