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3+2b\left(-5\right)=2b\times 4-6a\times 2b
Multiply both sides of the equation by 2b.
3-10b=2b\times 4-6a\times 2b
Multiply 2 and -5 to get -10.
3-10b=8b-6a\times 2b
Multiply 2 and 4 to get 8.
3-10b=8b-12ab
Multiply -6 and 2 to get -12.
8b-12ab=3-10b
Swap sides so that all variable terms are on the left hand side.
-12ab=3-10b-8b
Subtract 8b from both sides.
-12ab=3-18b
Combine -10b and -8b to get -18b.
\left(-12b\right)a=3-18b
The equation is in standard form.
\frac{\left(-12b\right)a}{-12b}=\frac{3-18b}{-12b}
Divide both sides by -12b.
a=\frac{3-18b}{-12b}
Dividing by -12b undoes the multiplication by -12b.
a=\frac{3}{2}-\frac{1}{4b}
Divide 3-18b by -12b.
3+2b\left(-5\right)=2b\times 4-6a\times 2b
Variable b cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by 2b.
3-10b=2b\times 4-6a\times 2b
Multiply 2 and -5 to get -10.
3-10b=8b-6a\times 2b
Multiply 2 and 4 to get 8.
3-10b=8b-12ab
Multiply -6 and 2 to get -12.
3-10b-8b=-12ab
Subtract 8b from both sides.
3-18b=-12ab
Combine -10b and -8b to get -18b.
3-18b+12ab=0
Add 12ab to both sides.
-18b+12ab=-3
Subtract 3 from both sides. Anything subtracted from zero gives its negation.
\left(-18+12a\right)b=-3
Combine all terms containing b.
\left(12a-18\right)b=-3
The equation is in standard form.
\frac{\left(12a-18\right)b}{12a-18}=-\frac{3}{12a-18}
Divide both sides by -18+12a.
b=-\frac{3}{12a-18}
Dividing by -18+12a undoes the multiplication by -18+12a.
b=-\frac{1}{2\left(2a-3\right)}
Divide -3 by -18+12a.
b=-\frac{1}{2\left(2a-3\right)}\text{, }b\neq 0
Variable b cannot be equal to 0.