Solve for x
x=9
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0.8x=0.8+6.4
Add 6.4 to both sides.
0.8x=7.2
Add 0.8 and 6.4 to get 7.2.
x=\frac{7.2}{0.8}
Divide both sides by 0.8.
x=\frac{72}{8}
Expand \frac{7.2}{0.8} by multiplying both numerator and the denominator by 10.
x=9
Divide 72 by 8 to get 9.
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