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(4/5)*x = 7/9-(7/10) // - 7/9-(7/10)
(4/5)*x-(7/9)+7/10 = 0
(4/5)*x-7/9+7/10 = 0
4/5*x-7/90 = 0 // + 7/90
4/5*x = 7/90 // : 4/5
x = 7/90/4/5
x = 7/72
x = 7/72
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