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