a=(7/b+1)-4
a+4 = 7/b + 1
b(a+4) = 7 + b
b a + 4b - b = 7
b (a+3) = 7
b = 7/(a+3)
i have fopur questions like this but don't undersand them. thanks
Rearrange the formula a=(7/b+1)-4 to make b the subject
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