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(-4/7)*x+1 = 23/35 // - 23/35
(-4/7)*x-(23/35)+1 = 0
(-4/7)*x-23/35+1 = 0
12/35-4/7*x = 0 // - 12/35
-4/7*x = -12/35 // : -4/7
x = -12/35/(-4/7)
x = 3/5
x = 3/5
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