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90/10 = 6*x-5*2*x // - 6*x-5*2*x
90/10-(6*x)-(-5*2*x) = 0
10*x-6*x+90/10 = 0
4*x+9 = 0 // - 9
4*x = -9 // : 4
x = -9/4
x = -9/4
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