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x in (-oo:+oo)
0.75*y = (1/4)*(x-3) // - (1/4)*(x-3)
0.75*y-((1/4)*(x-3)) = 0
(-1/4)*(x-3)+0.75*y = 0
0.75*y-1/4*(x-3) = 0
0.75*y-1/4*(x-3) = 0
0.75*y-1/4*x+3/4 = 0
0.75*y-1/4*x+3/4 = 0
0.75*y-1/4*x+3/4 = 0 // - 0.75*y+3/4
-1/4*x = -(0.75*y+3/4) // : -1/4
x = (-(0.75*y+3/4))/(-1/4)
x = 4*(0.75*y+3/4)
x = 4*(0.75*y+3/4)
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