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3*a-(a*((9*x)/5))-(9*a)+a*((4*x)/5) = 0
3*a+(-9/5)*a*x-9*a+a*((4*x)/5) = 0
-a*x-6*a = 0 // + -6*a
-a*x = -(-6*a) // : -a
x = (-(-6*a))/(-a)
x = -6
x = -6
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