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4*y-((4/3)*x) = 20 // - 20
4*y-((4/3)*x)-20 = 0
(-4/3)*x+4*y-20 = 0
4*y-4/3*x-20 = 0 // - 4*y-20
-4/3*x = -(4*y-20) // : -4/3
x = (-(4*y-20))/(-4/3)
x = -3/4*(20-(4*y))
x = -3/4*(20-(4*y))
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