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(-4/5)*x-(4*x)-(4/9) = -1964/45 // + -1964/45
(-4/5)*x-(4*x)-(4/9)-(-1964/45) = 0
(-4/5)*x-4*x-4/9+1964/45 = 0
216/5-24/5*x = 0 // - 216/5
-24/5*x = -216/5 // : -24/5
x = -216/5/(-24/5)
x = 9
x = 9
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