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5/9-4*x-x = -310/9 // + -310/9
5/9-4*x-x-(-310/9) = 0
5/9-4*x-x+310/9 = 0
35-5*x = 0 // - 35
-5*x = -35 // : -5
x = -35/(-5)
x = 7
x = 7
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