Remember your order of operations . . . multiplication/division comes before addition/subtraction.
A = a + (b/2)
Subtract 'a' from each side: A - a = b/2
Multiply each side by 2 : *** 2(A - a) = b***
To solve for b in the equation A = 2 a + b , first multiply both sides by 2 to get 2 A = a + b , then isolate b by subtracting a from both sides, resulting in b = 2 A − a .
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