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30/5 = 3*x-4*2*x // - 3*x-4*2*x
30/5-(3*x)-(-4*2*x) = 0
8*x-3*x+30/5 = 0
5*x+6 = 0 // - 6
5*x = -6 // : 5
x = -6/5
x = -6/5
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