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(1/5)*x+2/7 = 7*x // - 7*x
(1/5)*x-(7*x)+2/7 = 0
(1/5)*x-7*x+2/7 = 0
2/7-34/5*x = 0 // - 2/7
-34/5*x = -2/7 // : -34/5
x = -2/7/(-34/5)
x = 5/119
x = 5/119
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