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40/4 = 2*x-3*3*x // - 2*x-3*3*x
40/4-(2*x)-(-3*3*x) = 0
9*x-2*x+40/4 = 0
7*x+10 = 0 // - 10
7*x = -10 // : 7
x = -10/7
x = -10/7
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