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(1/5)*x+9/10 = 3*x // - 3*x
(1/5)*x-(3*x)+9/10 = 0
(1/5)*x-3*x+9/10 = 0
9/10-14/5*x = 0 // - 9/10
-14/5*x = -9/10 // : -14/5
x = -9/10/(-14/5)
x = 9/28
x = 9/28
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