Solve for x
x=3.9
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x-0.9=\frac{21.9}{7.3}
Divide both sides by 7.3.
x-0.9=\frac{219}{73}
Expand \frac{21.9}{7.3} by multiplying both numerator and the denominator by 10.
x-0.9=3
Divide 219 by 73 to get 3.
x=3+0.9
Add 0.9 to both sides.
x=3.9
Add 3 and 0.9 to get 3.9.
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