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2*x+(3*y)/4 = 5 // - 5
2*x+(3*y)/4-5 = 0
2*x+3/4*y-5 = 0 // - 3/4*y-5
2*x = -(3/4*y-5) // : 2
x = (-(3/4*y-5))/2
x = (5-(3/4*y))/2
x = (5-(3/4*y))/2
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