Solve for b
b=a-7
Solve for a
a=b+7
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-b=7-a
Subtract a from both sides.
\frac{-b}{-1}=\frac{7-a}{-1}
Divide both sides by -1.
b=\frac{7-a}{-1}
Dividing by -1 undoes the multiplication by -1.
b=a-7
Divide 7-a by -1.
a=7+b
Add b to both sides.
Examples
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Matrix
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Limits
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