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Solve for b
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Solve for a
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-7ab+b=-12a^{2}
Subtract 12a^{2} from both sides. Anything subtracted from zero gives its negation.
\left(-7a+1\right)b=-12a^{2}
Combine all terms containing b.
\left(1-7a\right)b=-12a^{2}
The equation is in standard form.
\frac{\left(1-7a\right)b}{1-7a}=-\frac{12a^{2}}{1-7a}
Divide both sides by -7a+1.
b=-\frac{12a^{2}}{1-7a}
Dividing by -7a+1 undoes the multiplication by -7a+1.