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3*x-(1.5*x)-(1.5/0.9) = 0
3*x-1.5*x-1.66666667 = 0
1.5*x-1.66666667 = 0 // + 1.66666667
1.5*x = 1.66666667 // : 1.5
x = 1.66666667/1.5
x = 1.11111111
x = 1.11111111
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