Solve for x
x=0.09
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4x+0.04=0.4
Combine 7x and -3x to get 4x.
4x=0.4-0.04
Subtract 0.04 from both sides.
4x=0.36
Subtract 0.04 from 0.4 to get 0.36.
x=\frac{0.36}{4}
Divide both sides by 4.
x=\frac{36}{400}
Expand \frac{0.36}{4} by multiplying both numerator and the denominator by 100.
x=\frac{9}{100}
Reduce the fraction \frac{36}{400} to lowest terms by extracting and canceling out 4.
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