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(-1/5)*x+1/35 = 1/7 // - 1/7
(-1/5)*x+1/35-(1/7) = 0
(-1/5)*x+1/35-1/7 = 0
-1/5*x-4/35 = 0 // + 4/35
-1/5*x = 4/35 // : -1/5
x = 4/35/(-1/5)
x = -4/7
x = -4/7
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