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(1/4)*(8*x-16)-((1/12)*(84*x-(2*v))) = 0
(1/4)*(8*x-16)+(-1/12)*(84*x-2*v) = 0
1/4*(8*x-16)-1/12*(84*x-2*v) = 0
1/4*(8*x-16)-1/12*(84*x-2*v) = 0
1/6*v-5*x-4 = 0
1/6*v-5*x-4 = 0
1/6*v-5*x-4 = 0 // - 1/6*v-4
-5*x = -(1/6*v-4) // : -5
x = (-(1/6*v-4))/(-5)
x = (4-(1/6*v))/(-5)
x = (4-(1/6*v))/(-5)
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