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Solve for t
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0.7t-0.3t=0.2
Subtract 0.3t from both sides.
0.4t=0.2
Combine 0.7t and -0.3t to get 0.4t.
t=\frac{0.2}{0.4}
Divide both sides by 0.4.
t=\frac{2}{4}
Expand \frac{0.2}{0.4} by multiplying both numerator and the denominator by 10.
t=\frac{1}{2}
Reduce the fraction \frac{2}{4} to lowest terms by extracting and canceling out 2.