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a-10=\frac{28}{0.7}
Divide both sides by 0.7.
a-10=\frac{280}{7}
Expand \frac{28}{0.7} by multiplying both numerator and the denominator by 10.
a-10=40
Divide 280 by 7 to get 40.
a=40+10
Add 10 to both sides.
a=50
Add 40 and 10 to get 50.