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4-((1/2)*x) = 3*y // - 3*y
4-((1/2)*x)-(3*y) = 0
(-1/2)*x-3*y+4 = 0
4-1/2*x-3*y = 0 // - 4-3*y
-1/2*x = -(4-3*y) // : -1/2
x = (-(4-3*y))/(-1/2)
x = 2*(4-3*y)
x = 2*(4-3*y)
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