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(1/5)*x-(4*x)+4/7 = 1703/420 // - 1703/420
(1/5)*x-(4*x)+4/7-(1703/420) = 0
(1/5)*x-4*x+4/7-1703/420 = 0
-19/5*x-209/60 = 0 // + 209/60
-19/5*x = 209/60 // : -19/5
x = 209/60/(-19/5)
x = -11/12
x = -11/12
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