Solve for x
x=7
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0.5x=7.7-4.2
Subtract 4.2 from both sides.
0.5x=3.5
Subtract 4.2 from 7.7 to get 3.5.
x=\frac{3.5}{0.5}
Divide both sides by 0.5.
x=\frac{35}{5}
Expand \frac{3.5}{0.5} by multiplying both numerator and the denominator by 10.
x=7
Divide 35 by 5 to get 7.
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