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(7/12)*x+4/10-(1/15) = 0
(7/12)*x+4/10-1/15 = 0
7/12*x+1/3 = 0 // - 1/3
7/12*x = -1/3 // : 7/12
x = -1/3/7/12
x = -4/7
x = -4/7
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