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12 = (2*x)/5 // - (2*x)/5
12-((2*x)/5) = 0
(-2/5)*x+12 = 0
12-2/5*x = 0 // - 12
-2/5*x = -12 // : -2/5
x = -12/(-2/5)
x = 30
x = 30
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