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((2*a)/7)*(a/2+14)+(6/7)*((4*x)/3-(21/y)) = 0
((2*a)/7)*(a/2+14)+(6/7)*((4*x)/3-21*y^-1) = 0
2/7*a*(1/2*a+14)+6/7*(4/3*x-21*y^-1) = 0
2/7*a*(1/2*a+14)+6/7*(4/3*x-21*y^-1) = 0
1/7*a^2+4*a+8/7*x-18*y^-1 = 0
1/7*a^2+4*a+8/7*x-18*y^-1 = 0
1/7*a^2+4*a+8/7*x-18*y^-1 = 0 // - 1/7*a^2+4*a-18*y^-1
8/7*x = -(1/7*a^2+4*a-18*y^-1) // : 8/7
x = (-(1/7*a^2+4*a-18*y^-1))/8/7
x = -7/8*(1/7*a^2+4*a-18*y^-1)
x = -7/8*(1/7*a^2+4*a-18*y^-1)
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