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(2/7)*x+(3/10)*y-1 = 0
2/7*x+3/10*y-1 = 0 // - 3/10*y-1
2/7*x = -(3/10*y-1) // : 2/7
x = (-(3/10*y-1))/2/7
x = 7/2*(1-(3/10*y))
x = 7/2*(1-(3/10*y))
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