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Apply inverse operations to isolate b_2.
b_2=2A/h-b_1
LHS * 2=RHS* 2
2 * a/2= a
.LHS /h.=.RHS /h.
a/b=.a /h./.b /h.
a/1=a
Remove parentheses
LHS-b_1=RHS-b_1
Rearrange equation