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3*x+4*y+(9-4)/2 = 19 // - 19
3*x+4*y+(9-4)/2-19 = 0
3*x+4*y-33/2 = 0 // - 4*y-33/2
3*x = -(4*y-33/2) // : 3
x = (-(4*y-33/2))/3
x = (33/2-(4*y))/3
x = (33/2-(4*y))/3
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