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7*a-a-(a*((2*x)/5))-(a*((7*x)/5)) = 0
(-2/5)*a*x-a+7*a+(-7/5)*a*x = 0
6*a-9/5*a*x = 0 // - 6*a
-9/5*a*x = -(6*a) // : -9/5*a
x = (-(6*a))/(-9/5*a)
x = 10/3
x = 10/3
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