Solve for y_1
y_{1}=-10
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3y_{1}=-20-10
Subtract 10 from both sides.
3y_{1}=-30
Subtract 10 from -20 to get -30.
y_{1}=\frac{-30}{3}
Divide both sides by 3.
y_{1}=-10
Divide -30 by 3 to get -10.
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