Simplify 12c−7d+5c−2d12c - 7d + 5c - 2d12c−7d+5c−2d
Hence solve 12c−7d+5c−2d=2512c - 7d + 5c - 2d = 2512c−7d+5c−2d=25 when d=1d = 1d=1
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