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(4/5)*x+9 = 7*x+14/5 // - 7*x+14/5
(4/5)*x-(7*x)-(14/5)+9 = 0
(4/5)*x-7*x-14/5+9 = 0
31/5-31/5*x = 0 // - 31/5
-31/5*x = -31/5 // : -31/5
x = -31/5/(-31/5)
x = 1
x = 1
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