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(1/2)*(12*x-16)-((1/4)*(8*x-(7*y))) = 0
(1/2)*(12*x-16)+(-1/4)*(8*x-7*y) = 0
1/2*(12*x-16)-1/4*(8*x-7*y) = 0
1/2*(12*x-16)-1/4*(8*x-7*y) = 0
4*x+7/4*y-8 = 0
4*x+7/4*y-8 = 0
4*x+7/4*y-8 = 0 // - 7/4*y-8
4*x = -(7/4*y-8) // : 4
x = (-(7/4*y-8))/4
x = (8-(7/4*y))/4
x = (8-(7/4*y))/4
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