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2c + 5a = 1.7 ( 3 )
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-6c - 4a = -2.90
6c + 15a = 5.10
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11a = 2. 20
a = 0.20
2c + 5a = 1.7
2c + 5 ( 0.2 ) = 1.7
2c + 1 = 1.7
2c = 1.7 - 1
2c = 0.7
c = 0.35
cristal = 0.35 acero = 0.2