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a*((11*x)/8)-5*a-(8*a)-(a*((3*x)/8)) = 0
a*((11*x)/8)-5*a-8*a+(-3/8)*a*x = 0
a*x-13*a = 0 // + -13*a
a*x = -(-13*a) // : a
x = (-(-13*a))/a
x = 13
x = 13
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