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5*x+(2/3)*y = 12 // - 12
5*x+(2/3)*y-12 = 0
5*x+2/3*y-12 = 0 // - 2/3*y-12
5*x = -(2/3*y-12) // : 5
x = (-(2/3*y-12))/5
x = (12-(2/3*y))/5
x = (12-(2/3*y))/5
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