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a*((10*x)/2)-(5*a)+7*a-(a*((11*x)/2)) = 0
a*((10*x)/2)-5*a+7*a+(-11/2)*a*x = 0
2*a-1/2*a*x = 0 // - 2*a
-1/2*a*x = -(2*a) // : -1/2*a
x = (-(2*a))/(-1/2*a)
x = 4
x = 4
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