Solve for y
y=16
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0.4y=6.4
Combine 0.7y and -0.3y to get 0.4y.
y=\frac{6.4}{0.4}
Divide both sides by 0.4.
y=\frac{64}{4}
Expand \frac{6.4}{0.4} by multiplying both numerator and the denominator by 10.
y=16
Divide 64 by 4 to get 16.
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