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(1/2)*(12*x-12)-((1/7)*(14*x-(2*y))) = 0
(1/2)*(12*x-12)+(-1/7)*(14*x-2*y) = 0
1/2*(12*x-12)-1/7*(14*x-2*y) = 0
1/2*(12*x-12)-1/7*(14*x-2*y) = 0
4*x+2/7*y-6 = 0
4*x+2/7*y-6 = 0
4*x+2/7*y-6 = 0 // - 2/7*y-6
4*x = -(2/7*y-6) // : 4
x = (-(2/7*y-6))/4
x = (6-(2/7*y))/4
x = (6-(2/7*y))/4
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