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(3/4)*x-(2*y)+7 = 0
(3/4)*x-2*y+7 = 0
3/4*x-2*y+7 = 0 // - 7-2*y
3/4*x = -(7-2*y) // : 3/4
x = (-(7-2*y))/3/4
x = -4/3*(7-2*y)
x = -4/3*(7-2*y)
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