Solve for a
a=\frac{3-b}{112}
Solve for b
b=3-112a
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112a=3-b
Subtract b from both sides.
\frac{112a}{112}=\frac{3-b}{112}
Divide both sides by 112.
a=\frac{3-b}{112}
Dividing by 112 undoes the multiplication by 112.
b=3-112a
Subtract 112a from both sides.
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