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(-2/5)*x+x+5/9 = 61/450 // - 61/450
(-2/5)*x+x+5/9-(61/450) = 0
(-2/5)*x+x+5/9-61/450 = 0
3/5*x+21/50 = 0 // - 21/50
3/5*x = -21/50 // : 3/5
x = -21/50/3/5
x = -7/10
x = -7/10
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