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11*a-4*a-(a*((5*x)/7))-(a*((11*x)/7)) = 0
(-5/7)*a*x-4*a+11*a+(-11/7)*a*x = 0
7*a-16/7*a*x = 0 // - 7*a
-16/7*a*x = -(7*a) // : -16/7*a
x = (-(7*a))/(-16/7*a)
x = 49/16
x = 49/16
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