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4*a-(a*((15*x)/12)) = 0
4*a+(-5/4)*a*x = 0
4*a-5/4*a*x = 0 // - 4*a
-5/4*a*x = -(4*a) // : -5/4*a
x = (-(4*a))/(-5/4*a)
x = 16/5
x = 16/5
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