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30 = (6/5)*x // - (6/5)*x
30-((6/5)*x) = 0
(-6/5)*x+30 = 0
30-6/5*x = 0 // - 30
-6/5*x = -30 // : -6/5
x = -30/(-6/5)
x = 25
x = 25
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