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(-4/5)*x+5/3 = -13/10 // + -13/10
(-4/5)*x+5/3-(-13/10) = 0
(-4/5)*x+5/3+13/10 = 0
89/30-4/5*x = 0 // - 89/30
-4/5*x = -89/30 // : -4/5
x = -89/30/(-4/5)
x = 89/24
x = 89/24
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