SOLUTION:
=) 12b + 8 + 2 = 64
=) 12b + 10 = 64
=) 12b = 64 - 10
=) b = 54/12
=) b = 9/2
=) b = 4.5
[tex] \bf \red\heartsuit Answer \red\heartsuit[/tex]
[tex] \\ \\ [/tex]
[tex] \dashrightarrow \tt4(3b + 2)2 = 64[/tex]
[tex] \\ \\ [/tex]
[tex] \dashrightarrow \tt4 \times 2(3b + 2) = 64[/tex]
[tex] \\ \\ [/tex]
[tex] \dashrightarrow \tt8(3b + 2) = 64[/tex]
[tex] \\ \\ [/tex]
[tex] \dashrightarrow \tt(3b + 2) = \dfrac{64}{8} [/tex]
[tex] \\ \\ [/tex]
[tex] \dashrightarrow \tt(3b + 2) = \cancel \dfrac{64}{8} [/tex]
[tex] \\ \\ [/tex]
[tex] \dashrightarrow \tt3b + 2=8[/tex]
[tex] \\ \\ [/tex]
[tex] \dashrightarrow \tt3b=8 - 2[/tex]
[tex] \\ \\ [/tex]
[tex] \dashrightarrow \tt3b=6[/tex]
[tex] \\ \\ [/tex]
[tex] \dashrightarrow \tt{}b= \dfrac{6}{3} [/tex]
[tex] \\ \\ [/tex]
[tex] \dashrightarrow \tt{}b= \bf2[/tex]
