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5*a-(a*((12*x)/3))-(8*a)-(a*((5*x)/3)) = 0
5*a-4*a*x-8*a+(-5/3)*a*x = 0
-17/3*a*x-3*a = 0 // + -3*a
-17/3*a*x = -(-3*a) // : -17/3*a
x = (-(-3*a))/(-17/3*a)
x = -9/17
x = -9/17
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