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(1)*2 + + (-2)*7 = 0
2 + S2+ (-14) = 0
S2 = 14 - 2
S2 = 12
S = 6 <--
2Biloks S + 7Biloks O = -2
2Biloks S + 7(-2) = -2
2Biloks S -14 = -2
2Biloks S = -2 + 14
2Biloks S = 12
Biloks S = 6