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The method used is usually to isolate the value being solved for on the left hand side of the equation

so, when we are told that

a = 2bc - d

we switch the equation around and get

2bc - d = a

Then we add 'd' to each side and get

2bc = a + d

Then we divide both sides by '2b' and get

c = (a + d) / 2b

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14y ago

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