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3*a-(a*((10*z)/3))-(10*a)-(a*((7*x)/3)) = 0
3*a+(-10/3)*a*z-10*a+(-7/3)*a*x = 0
-7/3*a*x-7*a-10/3*a*z = 0 // + -7*a-10/3*a*z
-7/3*a*x = -(-7*a-10/3*a*z) // : -7/3*a
x = (-(-7*a-10/3*a*z))/(-7/3*a)
x = 3/7*a^-1*(-7*a-10/3*a*z)
x = 3/7*a^-1*(-7*a-10/3*a*z)
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