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4*x+(3/4)*y = 11 // - 11
4*x+(3/4)*y-11 = 0
4*x+3/4*y-11 = 0 // - 3/4*y-11
4*x = -(3/4*y-11) // : 4
x = (-(3/4*y-11))/4
x = (11-(3/4*y))/4
x = (11-(3/4*y))/4
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