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