Solve for y
y=-3
Solve for x (complex solution)
x\in \mathrm{C}
y=-3
Solve for x
x\in \mathrm{R}
y=-3
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0-7y=21
Anything times zero gives zero.
-7y=21
Anything plus zero gives itself.
y=\frac{21}{-7}
Divide both sides by -7.
y=-3
Divide 21 by -7 to get -3.
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