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2*x-(3*y) = (1/4)*(x-13) // - (1/4)*(x-13)
2*x-((1/4)*(x-13))-(3*y) = 0
(-1/4)*(x-13)+2*x-3*y = 0
2*x-1/4*(x-13)-3*y = 0
2*x-1/4*(x-13)-3*y = 0
7/4*x-3*y+13/4 = 0
7/4*x-3*y+13/4 = 0
7/4*x-3*y+13/4 = 0 // - 13/4-3*y
7/4*x = -(13/4-3*y) // : 7/4
x = (-(13/4-3*y))/7/4
x = -4/7*(13/4-3*y)
x = -4/7*(13/4-3*y)
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