b divided by 2
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If a = -15, b = 5 and c = -2 a - b - c = -15 - 5 - (-2) = -20 + 2 = -18
a + c - b = 3 + 2 - 5 = 5 - 5 = 0
An unknown number, we'll call it B, is the same number as an unknown number C times 2.
7.5
b = sqrt32 or 4 root 2