Solve for x_300
x_{300}=15-y
Solve for y
y=15-x_{300}
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x_{300}+y=15
Swap sides so that all variable terms are on the left hand side.
x_{300}=15-y
Subtract y from both sides.
x_{300}+y=15
Swap sides so that all variable terms are on the left hand side.
y=15-x_{300}
Subtract x_{300} from both sides.
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