1/2 (4a + 10b) = c
Remove the 1/2 by multiplying both sides by 2:
4a + 10b = 2c
Subtract 4a from both sides:
10b = 2c -4a
Divide both sides by 10:
b = (2c-4a)/10
SImplify by the fraction:
b = (c - 2a)/5
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