Solve for x
x=10
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0.4x=4
Add 4 to both sides. Anything plus zero gives itself.
x=\frac{4}{0.4}
Divide both sides by 0.4.
x=\frac{40}{4}
Expand \frac{4}{0.4} by multiplying both numerator and the denominator by 10.
x=10
Divide 40 by 4 to get 10.
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