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\left(4a+12\right)\left(2a-1\right)=2\left(4a^{2}+8a-3\right)
Use the distributive property to multiply 4 by a+3.
8a^{2}+20a-12=2\left(4a^{2}+8a-3\right)
Use the distributive property to multiply 4a+12 by 2a-1 and combine like terms.
8a^{2}+20a-12=8a^{2}+16a-6
Use the distributive property to multiply 2 by 4a^{2}+8a-3.
8a^{2}+20a-12-8a^{2}=16a-6
Subtract 8a^{2} from both sides.
20a-12=16a-6
Combine 8a^{2} and -8a^{2} to get 0.
20a-12-16a=-6
Subtract 16a from both sides.
4a-12=-6
Combine 20a and -16a to get 4a.
4a=-6+12
Add 12 to both sides.
4a=6
Add -6 and 12 to get 6.
a=\frac{6}{4}
Divide both sides by 4.
a=\frac{3}{2}
Reduce the fraction \frac{6}{4} to lowest terms by extracting and canceling out 2.