Solve for y
y=13
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0.5y=6.5
Combine 0.9y and -0.4y to get 0.5y.
y=\frac{6.5}{0.5}
Divide both sides by 0.5.
y=\frac{65}{5}
Expand \frac{6.5}{0.5} by multiplying both numerator and the denominator by 10.
y=13
Divide 65 by 5 to get 13.
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