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(4/3)*a^2+a+(5/3)*x = 0
4/3*a^2+a+5/3*x = 0 // - 4/3*a^2+a
5/3*x = -(4/3*a^2+a) // : 5/3
x = (-(4/3*a^2+a))/5/3
x = -3/5*(4/3*a^2+a)
x = -3/5*(4/3*a^2+a)
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