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(-4/5)*x+2/3 = 46/105 // - 46/105
(-4/5)*x+2/3-(46/105) = 0
(-4/5)*x+2/3-46/105 = 0
8/35-4/5*x = 0 // - 8/35
-4/5*x = -8/35 // : -4/5
x = -8/35/(-4/5)
x = 2/7
x = 2/7
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