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(1/5)*x+2/3 = 61/105 // - 61/105
(1/5)*x+2/3-(61/105) = 0
(1/5)*x+2/3-61/105 = 0
1/5*x+3/35 = 0 // - 3/35
1/5*x = -3/35 // : 1/5
x = -3/35/1/5
x = -3/7
x = -3/7
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