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(-4*x)/5+1 = 7/15 // - 7/15
(-4*x)/5-(7/15)+1 = 0
(-4*x)/5-7/15+1 = 0
8/15-4/5*x = 0 // - 8/15
-4/5*x = -8/15 // : -4/5
x = -8/15/(-4/5)
x = 2/3
x = 2/3
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